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11 slides, navy/teal/red color scheme — content sourced from Harrison's, Robbins, Tintinalli's & Sleisenger & Fordtran's:

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Named Signs in Bailey & Love, 28th Edition

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NEUROLOGY & SPINE (8)

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ORTHOPAEDICS - SHOULDER (8)

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ORTHOPAEDICS - ELBOW (1)

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ORTHOPAEDICS - HAND & WRIST (7)

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ORTHOPAEDICS - HIP (2)

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ORTHOPAEDICS - KNEE (6)

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ORTHOPAEDICS - FOOT & ANKLE (5)

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CARDIOTHORACIC SURGERY (9)

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THORACIC / PULMONARY (2)

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ABDOMINAL SURGERY - GENERAL (13)

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PANCREATOBILIARY (8)

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GASTROINTESTINAL SURGERY (6)

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VASCULAR SURGERY (3)

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ONCOLOGY / LYMPHATICS (4)

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ENDOCRINE SURGERY (2)

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DERMATOLOGY & BURNS (2)

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INFECTION / SOFT TISSUE (2)

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ENT / HEAD & NECK (5)

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UROLOGY (6)

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OBSTETRICS & GYNAECOLOGICAL SURGERY (3)

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GRAND TOTAL: 101 named signs/tests/manoeuvres

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Key Notes

• Trousseau's sign appears twice with entirely different meanings: (1) carpopedal spasm in hypocalcaemia and (2) migratory thrombophlebitis as a paraneoplastic phenomenon in malignancy
• Tinel's sign appears twice: at the wrist (CTS) and at the elbow (ulnar nerve)
• Crescent sign appears twice: in AVN of the hip (orthopaedics) and in pulmonary hydatid (thoracics)
• Anterior drawer sign applies to both the knee (ACL) and the ankle (ATFL)
• The aortic regurgitation cluster (Quincke, de Musset, Corrigan, Traube, Müller) all appear in a single paragraph describing peripheral signs of wide pulse pressure in AR
• The appendicitis cluster (Rovsing, Psoas, Obturator, Pointing, McBurney) is grouped together in the appendicitis chapter
• Peau d'orange and Hutchinson's sign are eponymous but not strictly "signs" of the named-person type; they are included as they represent named clinical findings used diagnostically

• Q.1 (30 marks): Anatomy of veins of lower limb + physiology of venous blood flow + etiology, clinical presentation, management and complications of varicose veins
• Q.2 (30 marks): Surgical anatomy of liver + enumerate functions of liver + life cycle of Echinococcus granulosus + clinical presentation, management and complications of hydatid cyst of liver
• Q.3 (20 marks): (a) Principles, types and hazards of electrosurgery (b) Duty of candour
• Q.4 (20 marks): (a) Acute limb ischaemia (b) Blast injuries

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MS General Surgery Year-1 — September 2025

Complete Answers According to Weightage

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Q.1 (30 Marks)

Anatomy of Veins of Lower Limb + Physiology of Venous Blood Flow + Varicose Veins

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PART A: ANATOMY OF VEINS OF LOWER LIMB

1. Superficial Venous System

• Longest vein in the body
• Arises from the medial end of the dorsal venous arch of the foot
• Ascends anterior to the medial malleolus
• Passes up the medial aspect of the leg and thigh
• Pierces the cribriform fascia of the saphenous opening (fossa ovalis) to drain into the femoral vein at the saphenofemoral junction (SFJ) — 3.5 cm below and lateral to the pubic tubercle
• Tributaries near the SFJ (the "tributaries of the groin"): superficial external pudendal, superficial epigastric, superficial circumflex iliac, anterolateral and posteromedial thigh veins
• The anterior accessory great saphenous vein (AAGSV) is a consistent tributary running anterolaterally

• Arises from the lateral end of the dorsal venous arch
• Passes posterior to the lateral malleolus
• Ascends in the midline of the posterior calf within the deep fascia
• Drains into the popliteal vein at the saphenopopliteal junction (SPJ) in the popliteal fossa — level is variable (usually between the knee crease and 8 cm above it)

2. Deep Venous System

• Begins as the anterior and posterior tibial veins and the peroneal veins in the leg — each arises from paired venae comitantes accompanying the corresponding arteries
• Anterior and posterior tibial veins unite to form the popliteal vein below the knee
• In the thigh: femoral vein (previously called superficial femoral vein — a deep vein despite the name) ascends to join the deep femoral (profunda femoris) vein and becomes the common femoral vein (CFV)
• CFV passes under the inguinal ligament to become the external iliac vein
• External iliac + internal iliac = common iliac vein → inferior vena cava

3. Perforating Veins (Communicating Veins)

• Connect the superficial to the deep system by penetrating the deep fascia
• Normally contain bicuspid valves that allow blood flow only from superficial to deep
• Clinically important perforators:
  • Hunterian perforator — mid-thigh
  • Dodd's perforator — lower thigh (adductor canal)
  • Boyd's perforator — below the knee medially
  • Cockett's perforators (I, II, III) — lower medial leg (posterior arch vein to posterior tibial veins) — most important in venous ulceration
  • May's perforator — lateral calf
• Incompetence of these perforators leads to transmission of high deep venous pressure to the superficial system

4. Venous Valves

• Bicuspid semilunar valves are present throughout the lower limb veins
• Number: approximately 8–20 valves in the GSV, 2–3 in the femoral vein
• Absent from the IVC and common iliac veins
• Function: direct blood flow towards the heart and prevent reflux

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PART B: PHYSIOLOGY OF VENOUS BLOOD FLOW

Mechanisms Aiding Venous Return

1. Vis a tergo (residual arterial pressure): Small but constant pressure transmitted from the arterial side through the capillaries (~10–15 mmHg at the venous end of the capillary)
2. Cardiac suction (vis a fronte): During right ventricular diastole, negative pressure draws blood into the right heart
3. Respiratory bellows (respiratory pump): On inspiration, intrathoracic pressure falls, increasing pressure gradient between peripheral veins and the thoracic great veins → blood is drawn upward. On expiration the cycle reverses
4. Calf muscle pump (peripheral heart): The most important mechanism. Contraction of the calf muscles (gastrocnemius, soleus) during walking compresses the intramuscular sinusoids and deep veins → expels blood upward. Competent valves prevent retrograde flow. At rest, ambulatory venous pressure (AVP) in the long saphenous vein at the ankle is ~80–90 mmHg (same as hydrostatic pressure). During walking, AVP normally falls to ~20–30 mmHg. In venous incompetence, AVP fails to fall adequately
5. Postural changes: In the supine position, all venous pressures are low and equivalent to cardiac filling pressure. On standing, hydrostatic pressure increases at the ankle to approximately 80–100 mmHg (depending on patient height)
6. Venous valves: Segment the column of blood, preventing reflux between pump cycles. Valve incompetence → venous hypertension

Pathophysiology of Venous Hypertension

• Capillary leak → oedema
• Fibrin pericapillary cuffing → impaired oxygen delivery to skin
• Leucocyte trapping → release of proteases and free radicals → lipodermatosclerosis
• Eventually → venous ulceration (typically above the medial malleolus — the "gaiter area")

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PART C: VARICOSE VEINS

Definition

Classification — CEAP Classification (Bailey & Love 28th Ed)

Etiology

• Intrinsic weakness of the vein wall (smooth muscle degeneration, reduced elastin/collagen)
• Primary valve incompetence at the SFJ or SPJ
• Familial predisposition (autosomal dominant with variable penetrance)

• Deep vein thrombosis (DVT) → post-thrombotic syndrome (valve destruction)
• Pelvic masses (pregnancy, ovarian tumours, pelvic lymphadenopathy) → external venous compression
• Arteriovenous fistula (congenital or acquired)
• Klippel-Trenaunay syndrome

Risk Factors

Clinical Presentation

• Aching, heaviness, throbbing, burning — worse at end of day and on prolonged standing
• Relieved by elevation and compression hosiery
• Itching
• Ankle swelling (oedema)
• Restless legs

• Visible tortuous, dilated subcutaneous veins
  • Medial thigh and calf → GSV incompetence
  • Posterolateral calf → SSV incompetence
  • Anterolateral thigh → AAGSV incompetence
• Ankle oedema
• Skin changes: haemosiderin pigmentation, lipodermatosclerosis, eczema, atrophie blanche
• Venous ulcer (medial gaiter area above medial malleolus)

• Trendelenburg test: Identifies SFJ incompetence (tourniquet test)
• Tourniquet/Perthe's test: Identifies level of incompetence and assesses deep vein patency
• Schwartz test: Percussion impulse test (tap GSV distally, feel the impulse proximally)

Investigations

1. Duplex ultrasonography (gold standard):
   • Identifies sites of reflux (SFJ, SPJ, perforators)
   • Confirms deep vein patency
   • Reflux defined as retrograde flow >0.5 seconds on Valsalva or cuff release
   • Maps the anatomy for treatment planning
   • Should be performed in the standing position
2. CT/MR venography: For complex cases, suspected pelvic venous disease or recurrent varicose veins
3. Blood tests: FBC, coagulation (pre-operative)

Management

• Compression hosiery (Class 2 or Class 3 stockings, 18–24 mmHg or 25–35 mmHg)
• Elevation of the leg
• Exercise, weight loss
• Indications: Patient preference, pregnancy, significant co-morbidities, borderline indications for treatment

1. Endovenous thermal ablation (first-line for GSV/SSV incompetence):
   • Endovenous laser ablation (EVLA): 1470 nm diode laser via catheter; tumescent anaesthesia applied pericircumferentially; laser fires on catheter pullback destroying the vein wall
   • Radiofrequency ablation (RFA/VNUS Closure): Radiofrequency energy heats the vein wall to 120°C via segmental heating at 6.5 cm segments
   • Both have >90% occlusion rates at 3 years; NICE-recommended first-line (NICE CG168)
   • Performed under local tumescent anaesthesia as day case
2. Foam sclerotherapy:
   • Sodium tetradecyl sulphate (STS) or polidocanol mixed with air/CO2 to create foam (Tessari or double-syringe technique)
   • Foam displaces blood and causes endothelial damage, thrombosis, and fibrosis
   • Second-line after thermal ablation
   • Used for residual/tributary varicosities and recurrent veins
   • Risk: stroke if patent foramen ovale (PFO) present; visual disturbance
3. Conventional surgery (high tie, strip and avulsions):
   • Flush ligation at SFJ (Trendelenburg operation): Division of GSV at SFJ with ligation of all tributaries
   • Stripping: Removal of GSV from groin to knee (preserving knee-to-ankle segment to preserve saphenous nerve)
   • Multiple phlebectomies (avulsions): Removal of tributary varices via 2 mm stab incisions
   • Recurrence rate ~30% at 10 years (neovascularization at groin)
   • Performed under general or spinal anaesthesia

Complications of Varicose Veins

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Q.2 (30 Marks)

Surgical Anatomy of Liver + Functions + Life Cycle of Echinococcus Granulosus + Hydatid Cyst

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PART A: SURGICAL ANATOMY OF THE LIVER

Gross Anatomy

• Largest solid organ; weighs 1200–1500 g in adults
• Lies in the right hypochondrium and epigastrium
• Covered by Glisson's capsule (dense fibrous capsule)
• Held in position by:
  • Hepatic veins draining into the IVC (main fixation)
  • Falciform ligament (anterior)
  • Right and left triangular ligaments
  • Coronary ligaments
  • Hepatoduodenal ligament (lesser omentum)

Lobar and Segmental Anatomy

• Right lobe: Separated from left lobe by falciform ligament and the line of the round ligament (ligamentum teres) on the anterior surface
• Left lobe: Smaller, lies in the epigastrium
• Caudate lobe (Spiegel's lobe): Posterior, receives blood from both right and left portal branches; drains directly into the IVC via short hepatic veins — autonomous blood supply
• Quadrate lobe: Between gallbladder fossa and the round ligament — functionally part of the left lobe

• True right and left lobes are separated by Cantlie's line (Rex-Cantlie plane) — runs from the middle of the gallbladder fossa anteriorly to the IVC posteriorly (through the main hepatic fissure / middle hepatic vein)
• This division (not the falciform ligament) is used for formal hepatectomy

• Right hepatic vein: Between right anterior and posterior sections
• Middle hepatic vein: Between right and left lobes (runs in Cantlie's line) — joins IVC often with left hepatic vein
• Left hepatic vein: Within left lobe

Portal Triad (at each segment)

• Portal vein (70% of hepatic blood flow, 50% of oxygen)
• Hepatic artery (30% of blood flow, 50% of oxygen)
• Bile duct

Blood Supply

• Hepatic artery proper branches from the common hepatic artery (from the coeliac axis) → splits into right hepatic artery and left hepatic artery in the hepatoduodenal ligament
• Accessory hepatic arteries: Common variants (10–15%): replaced right hepatic artery from SMA, replaced left hepatic artery from left gastric artery — must be identified at surgery to avoid ligation
• Cystic artery (usually from the right hepatic artery) supplies the gallbladder

• Portal vein formed by union of SMV and splenic vein behind the neck of pancreas
• Enters the liver at the porta hepatis and divides into right and left portal branches

• Right, middle and left hepatic veins → IVC at the upper right abdomen
• Multiple small short hepatic veins drain directly to the IVC (especially from the caudate lobe)

Biliary Anatomy

• Right and left hepatic ducts join outside the liver to form the common hepatic duct (CHD)
• CHD + cystic duct → common bile duct (CBD)
• CBD passes through the hepatoduodenal ligament, behind the duodenum, through the head of pancreas, and opens at the ampulla of Vater (sphincter of Oddi) on the second part of the duodenum
• Calot's triangle: Bounded by cystic duct (below), CHD/CBD (medially), and the inferior surface of the liver (superiorly) — contains the cystic artery and cystic lymph node — dissected in cholecystectomy
• Triangle of safety (critical view of safety): Defined by clearing the base of Calot's triangle of all fat/areolar tissue so that only two structures (cystic duct and cystic artery) are seen entering the gallbladder — mandatory before clipping in laparoscopic cholecystectomy

Lymphatics

Nerve Supply

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PART B: FUNCTIONS OF THE LIVER (Enumerate)

1. Metabolic Functions

• Carbohydrate metabolism: Glycogenesis (glucose → glycogen storage), glycogenolysis (glycogen → glucose), gluconeogenesis from amino acids/lactate; maintains blood glucose homeostasis
• Protein metabolism: Synthesis of albumin, clotting factors (I, II, V, VII, VIII, IX, X, XI, XII, XIII), complement proteins, acute phase proteins (CRP, fibrinogen); deamination of amino acids; urea synthesis (Krebs-Henseleit urea cycle) from NH3
• Fat metabolism: Fatty acid oxidation (β-oxidation); synthesis of cholesterol, phospholipids, triglycerides; lipoprotein formation (VLDL, HDL); ketogenesis; bile acid synthesis from cholesterol

2. Bile Secretion

• Hepatocytes secrete ~600–1000 mL of bile per day
• Bile contains bile acids, bilirubin, cholesterol, phospholipids, electrolytes
• Bile acids (cholic acid, chenodeoxycholic acid) are conjugated with glycine/taurine → bile salts → emulsify dietary fats, facilitate micellar formation, essential for fat-soluble vitamin (A, D, E, K) absorption
• Enterohepatic circulation of bile salts: 95% reabsorbed in terminal ileum → portal circulation → liver

3. Detoxification and Biotransformation

• Phase I reactions (oxidation, reduction, hydrolysis via CYP450 enzymes)
• Phase II reactions (conjugation: glucuronidation, sulfation, acetylation, glutathione conjugation) → convert lipophilic compounds to water-soluble forms for urinary/biliary excretion
• Detoxification of: drugs, alcohol, ammonia, bilirubin (conjugation), steroids, xenobiotics

4. Bilirubin Metabolism

• Unconjugated (indirect) bilirubin from haem breakdown (RBC destruction in RES) → transported to liver bound to albumin → conjugated by hepatocyte glucuronyl transferase → bilirubin diglucuronide (direct bilirubin) → excreted in bile → converted by colonic bacteria to urobilinogen/stercobilin

5. Storage

• Glycogen (~100 g)
• Fat-soluble vitamins: A (1–2 year supply), D, E, K
• Vitamin B12 (3–5 year supply)
• Iron (as ferritin and haemosiderin)
• Copper

6. Haematopoiesis (Foetal/Extramedullary)

• Primary site of haematopoiesis in the foetus (4th–6th months)
• Resumes extramedullary haematopoiesis in myeloproliferative conditions in adults

7. Immunological Functions

• Kupffer cells (hepatic macrophages) — phagocytosis of bacteria, debris from portal blood
• Synthesis of complement proteins (C3, C5)
• Site of first-pass immune surveillance of gut-derived antigens

8. Coagulation

• Synthesis of all clotting factors except vWF (Factor VIII component, synthesised by endothelium)
• Vitamin K-dependent factors: II (prothrombin), VII, IX, X, proteins C and S — need hepatic γ-carboxylation

9. Endocrine Functions

• Synthesis of IGF-1 (insulin-like growth factor 1) in response to GH
• Conversion of T4 → T3 (deiodinase)
• 25-hydroxylation of vitamin D → 25-hydroxyvitamin D (second step of vitamin D activation)
• Angiotensinogen synthesis

10. Haemostasis

• Clearance of activated clotting factors and fibrin degradation products

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PART C: LIFE CYCLE OF ECHINOCOCCUS GRANULOSUS

Hosts

Life Cycle (Step by Step)

1. Adult worm in definitive host (dog):
   • E. granulosus lives in the proximal small intestine of the dog attached to the intestinal mucosa by hooklets and suckers
   • Consists of scolex (head), neck, and 3–4 proglottids (immature, mature, and gravid)
   • Gravid proglottid contains ~500–800 eggs
   • Eggs/gravid proglottids are shed in dog faeces → contaminate pastures, soil, water, dog fur
2. Egg ingestion by intermediate host:
   • Sheep or cattle (or humans accidentally) ingest eggs with contaminated food, water, or direct contact with infected dog
   • Eggs are highly resistant to environmental conditions (survive months in soil)
3. Oncosphere release and penetration:
   • In the duodenum of the intermediate host, digestive enzymes dissolve the embryophore coat
   • The six-hooked oncosphere (hexacanth embryo) is released
   • Oncosphere penetrates the intestinal mucosa using hooks and proteolytic enzymes → enters portal blood → carried to the liver (first filter — 70% of cysts)
4. Cyst development in intermediate host (larval stage):
   • Oncosphere reaches the liver (or lungs, brain, bone, etc.)
   • Develops into a hydatid cyst (metacestode) over months to years
   • Cyst structure:
     • Pericyst (host-derived): Outer layer of compressed host fibrous/granulomatous tissue
     • Ectocyst (laminated membrane): Middle white, laminated layer (parasite-derived); 1–2 mm thick; acellular, permeable
     • Endocyst (germinal/germinative layer): Inner nucleated layer; the true parasite; secretes hydatid fluid and produces brood capsules, scolices, and daughter cysts
   • Brood capsules bud from the germinal layer; each contains protoscolices (10–30 per capsule)
   • Hydatid sand: Sediment of detached protoscolices, brood capsules, hooks
   • Daughter cysts: Secondary cysts that develop within the mother cyst from germinal layer buds
5. Completion of cycle (predation):
   • When a dog eats the infected viscera of a sheep (e.g., at slaughter), the protoscolices are released in the dog's intestine
   • Each protoscolex evaginates and attaches to the intestinal mucosa → develops into an adult tapeworm within 4–7 weeks
   • Cycle is complete

Human Infection (Accidental Dead-End Host)

• Humans ingest eggs (hand-to-mouth contact with infected dogs, contaminated vegetables/water)
• Humans are dead-end hosts — cannot complete the life cycle (humans are not eaten by dogs in typical endemic settings)
• Distribution of cysts in humans: Liver 70%, Lung 15%, Other sites (brain, bone, kidney, spleen) 15%

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PART D: HYDATID CYST OF LIVER — Clinical Presentation, Management and Complications

Clinical Presentation

• Often asymptomatic for years (slow growth: ~1 cm/year)
• Right hypochondrial/epigastric pain or discomfort (most common symptom)
• Feeling of fullness
• Hepatomegaly (smooth, non-tender in simple cysts)
• Jaundice (if cyst communicates with or compresses biliary tree)
• Pruritus, urticaria (due to cyst leak/minor rupture → allergic sensitization)
• Fever (if superinfected)
• Anaphylaxis (if cyst ruptures suddenly — life-threatening emergency)

• Hepatomegaly — palpable smooth mass
• Hydatid thrill (fremitus hydatidique) — rare, specific
• Jaundice (biliary involvement)
• Features of anaphylaxis (rupture)

Investigations

1. Ultrasonography (first-line):
   • WHO-IWGE classification (CE1–CE5) based on cyst activity:
     • CE1: Unilocular, anechoic with double line (active)
     • CE2: Multivesicular with daughter cysts (active)
     • CE3a: Detached membrane (floating lily pad sign) — transitional
     • CE3b: Solid matrix with daughter cysts — transitional
     • CE4: Heterogeneous, no daughter cysts (inactive)
     • CE5: Calcified wall (inactive)
2. CT scan: Best defines anatomy, number, size, location, biliary communication, calcification; guides intervention
3. MRI: Superior for biliary communication, multiplanar views
4. Serology:
   • Casoni skin test (historical)
   • ELISA for anti-echinococcal antibodies (IgG) — sensitivity ~90% for hepatic cysts
   • Immunoblot (Western blot) — confirmatory (Band 5 — most specific)
   • Note: serology may be negative in calcified/inactive cysts
5. CXR: Rule out pulmonary involvement
6. Eosinophilia: Present in ~25% of cases
7. LFTs: May show elevated alkaline phosphatase/bilirubin if biliary involvement
8. ERCP/MRCP: If biliary communication suspected (jaundice, cholangitis)

Important: Diagnostic aspiration is CONTRAINDICATED due to risk of anaphylaxis and peritoneal seeding

Management

• Albendazole (15 mg/kg/day in two divided doses with fatty meal for better absorption; 28-day cycles with 14-day rest periods; 3–6 cycles)
• Mechanism: Inhibits tubulin polymerization → impairs glucose uptake by scolices
• Indications: Inoperable cases, pre-operative (to sterilize cyst, reduce viability), post-operative (prevent seeding), multiple small cysts
• Monitoring: LFTs every 4 weeks (hepatotoxicity)

• Ultrasound-guided percutaneous approach
• Puncture: 22-gauge needle into cyst (ensuring no biliary communication on CT/MRCP first)
• Aspiration: Withdraw hydatid fluid (straw-coloured if uncomplicated)
• Injection: Scolicidal agent — 20% hypertonic saline (preferred) or 0.5% silver nitrate or 95% ethanol — left for 15 minutes to kill scolices
• Re-aspiration: Withdraw scolicidal agent
• Performed under antibiotic cover
• Pre-treated with albendazole (4 days before to 1 month after)
• Contraindications: Cysts communicating with biliary tree (risk of sclerosing cholangitis), inaccessible location, CE4/CE5 inactive cysts, coagulopathy
• Success rate ~95% for appropriate cysts

• Indications: Large cysts (>5 cm), CE2/CE3b cysts, cysts in dangerous locations, biliary communication, infected cysts, failed PAIR
• Pre-operative albendazole: 4 days–1 month before surgery
• Scolicidal agents used intra-operatively: 20% hypertonic saline, 0.5% povidone-iodine or cetrimide
  • Note: formalin no longer used (sclerosing cholangitis risk)
• Operative procedures:
  • Conservative (organ-preserving):
    • Cystectomy (enucleation/pericystectomy): Evacuation of cyst contents + removal of endocyst; pericyst left in situ; omentoplasty (Lagrot's procedure) fills the residual cavity
    • Inject scolicidal agent into the cyst → aspirate → open the pericyst → remove all endocyst, daughter cysts, and hydatid sand
    • Biliary openings within the cyst are carefully oversewn
    • Residual cavity managed by: omentoplasty, external drainage, capitonnage (suturing of pericyst walls), marsupialization
  • Radical:
    • Total pericystectomy: En-bloc removal including pericyst — curative, lower recurrence; technically demanding; risk of biliary injury
    • Hepatic segmentectomy/lobectomy: For large/multiple cysts or those in one lobe; definitive
  • Laparoscopic approach: Increasingly used at experienced centres; same principles; requires careful protection of peritoneum from spillage (gauze soaked in scolicidal)
• Management of biliary communication:
  • Small openings: oversewn
  • Large biliary fistula: ERCP + sphincterotomy; hepaticojejunostomy (for proximal bile duct obstruction)
• Idealmanagement: Tertiary unit, MDT (hepatobiliary surgeon, physician, interventional radiologist)

Complications of Hydatid Cyst of Liver

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Q.3a (10 Marks)

Principles, Types, and Hazards of Electrosurgery

Definition

Principles

• Current (I) passes through the resistance of tissue (R) → generates heat: Power = I²R (Joule heating)
• Heat is concentrated at the active electrode (small area = high current density) vs. the dispersive/patient plate (large area = low current density, no significant heat)

1. Current density — inversely proportional to contact area. Small electrode tip = concentrated heat; large dispersive plate = negligible heating
2. Waveform: Determines effect:
   • Continuous sine wave = cutting (rapid, uniform cell vaporization)
   • Intermittent burst waveform = coagulation (slow heating, protein denaturation without vaporization)
   • Blend mode: Mixture — cut with partial haemostasis
3. Power setting (Watts): Higher power = faster, deeper effect
4. Time of application: Longer application = more heat spread and lateral thermal damage

Types of Electrosurgery

• Circuit: Current flows from the generator → active electrode (surgical pencil/diathermy probe) → through the patient's body → exits via the dispersive/patient electrode (grounding pad) → returns to generator
• Dispersive electrode must be placed on well-vascularised muscle bulk (e.g., thigh, buttock), avoiding scar tissue, bony prominences, prostheses
• Cutting mode: Continuous sine wave at low voltage → rapid cell heating to 100°C → intracellular water vaporizes → cells explode → clean incision
• Coagulation mode: High voltage, interrupted wave → less efficient heat transfer → slower heating → protein coagulation without vaporization → coagulum seals vessels
• Fulguration: "Spraying" current from a distance without contact → produces eschar on bleeding surface
• Uses: Cutting, dissection, spot coagulation, larger vessels
• Bipolar forceps recommended where monopolar is contraindicated (see below)

• Both active and return electrodes are incorporated into the same instrument (e.g., bipolar forceps)
• Current passes only through the tissue held between the tips of the forceps — extremely localised effect
• No dispersive plate required
• Advantages over monopolar:
  • No current spread through the body
  • Safe near neurovascular structures (e.g., facial nerve in parotidectomy, NVB in radical prostatectomy)
  • Safe with cardiac pacemakers
  • Safe in laparoscopic surgery where monopolar current spread (capacitive coupling, direct coupling) is a risk
• Uses: Neurosurgery, delicate haemostasis, day-case surgery, laparoscopy

• LigaSure / EnSeal (vessel sealing systems): Bipolar devices applying controlled energy + mechanical compression to seal vessels up to 7 mm → creates collagen-elastin weld; provides real-time tissue impedance feedback; minimal lateral thermal spread
• Harmonic scalpel (ultrasonic): Vibrates at 55,500 Hz; mechanical energy → heat (50–100°C); coagulates and cuts; minimal electrical current; safe in monopolar-contraindicated situations; more expensive
• Argon beam coagulator: Monopolar current conducted through a stream of argon gas; superficial, uniform coagulation of large areas (e.g., liver surface haemostasis); plasma coagulation

Hazards of Electrosurgery

• Dispersive electrode burn: If the pad has inadequate contact, is placed over scar tissue/bony prominence, is displaced, or if the circuit is faulty → current density at the pad increases → burn. Prevention: correct pad placement, check before use
• Alternate site burns: Current may exit via inadvertent contacts (ECG leads, monitoring probes, metal operating table parts) if the dispersive pad has poor contact
• Isolated circuit burn: From faulty insulation

• Capacitive coupling: Current can be induced in adjacent conductive instruments/trocars through an intact insulator (without direct contact) → inadvertent burn to bowel or other viscera, which may be remote from the operative field
• Direct coupling: Direct contact between the active electrode and another metal instrument (e.g., another trocar) → current conducted to unintended tissue
• Insulation failure: Breaks in the insulating sheath of laparoscopic instruments → current leakage
• All these can produce delayed, unrecognised bowel burns — perforations may manifest days later
• Prevention: Use active electrode monitoring (AEM) systems, avoid wrapping monopolar cables around metal instruments, use bipolar when near bowel

• Monopolar current can interfere with pacemakers → inappropriate inhibition or reprogramming
• Prevention: Use bipolar diathermy; keep active electrode >15 cm from pacemaker; use short bursts; ensure cardiology advice/pacemaker programming pre-operatively; have external defibrillator available

• Diathermy sparks can ignite alcohol-based skin preparation agents → fire
• Hydrogen accumulation in the bowel (from bowel prep or gases) can be ignited
• Draping material can catch fire
• Prevention: Allow skin prep to dry completely before applying drapes and using diathermy; ensure adequate bowel preparation; use non-flammable skin preparation agents where possible

• Vaporised cellular material produces smoke containing carcinogens, viral DNA, bacteria
• SARS-CoV-2 has been detected in surgical smoke
• Prevention: Smoke evacuators, adequate ventilation, N95 masks for laparoscopic cases (CO2 being released at port removal)

• At frequencies <10 kHz, alternating current can stimulate nerves and muscles → unintended movement during surgery (rare with modern generators operating at >300 kHz)

• Haematoma formation (inadequate haemostasis mistaken for diathermy seal)
• Delayed haemorrhage (eschar separates from a vessel)
• Visceral damage from inadvertent activation ("accidental coagulation")
• Impaired healing at wound edges (excessive use → tissue necrosis)

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Q.3b (10 Marks)

Duty of Candour

Definition

Legislative and Professional Framework (UK)

1. Statutory Duty of Candour (Organisational):
   • Introduced under Regulation 20 of the Health and Social Care Act 2008 (Regulated Activities) Regulations 2014 (enforced from November 2014 for NHS bodies)
   • All NHS trusts and foundation trusts in England have a statutory duty to be candid with patients
   • Applies when a "notifiable safety incident" occurs — defined as any unintended or unexpected incident that could result in, or appears to have resulted in, the death of or severe/moderate/prolonged psychological harm to the patient
2. Professional Duty of Candour:
   • Introduced jointly by the General Medical Council (GMC) and Nursing and Midwifery Council (NMC) in 2015
   • Applies to all registered healthcare professionals
   • States: "Every healthcare professional must be open and honest with patients when something goes wrong with their treatment or care which causes, or has the potential to cause, harm or distress"
3. The Francis Report (2013):
   • Mid Staffordshire NHS Foundation Trust Public Inquiry highlighted systemic failures in candour
   • Recommended a statutory duty of candour; foundation for current legislation

Core Components of the Duty of Candour

1. Tell the patient (or their family/representative) when something has gone wrong — as soon as reasonably practicable
2. Apologise sincerely — an apology does not constitute an admission of legal liability
3. Offer a reasonable explanation of what went wrong and the short- and long-term effects
4. Provide support to the patient and their family — practical help, emotional support
5. Explain what further treatment or care is needed as a result
6. Provide a written record of the notification, explanation, and apology
7. Learn from the incident and make necessary improvements to prevent recurrence

Notifiable Safety Incidents (Regulation 20)

• An unexpected or unintended incident in the provision of care results in:
  • Death
  • Severe harm (permanent lessening of bodily, sensory, motor, physiological or intellectual function; changes to structure; necessitates treatment to prevent death or severe harm; intervention required to save life)
  • Moderate harm (semi-permanent harm, increase in treatment)
  • Prolonged psychological harm (≥28 days)

Relationship to Surgical Practice

• Intra-operative complications not disclosed to the patient
• Missed diagnoses causing harm
• Wrong-site surgery
• Retained foreign bodies
• Inadvertent organ/vessel injury
• Post-operative complications not disclosed
• Consent obtained under false premises

Candour vs Confidentiality

• Disclosure to the next of kin or legally appointed representative
• Must follow the Mental Capacity Act (2005) principles

What Candour is NOT

• It is NOT an admission of clinical negligence
• An apology does not affect professional indemnity claims (Civil Liability Act protection)
• It is not optional — failure is a regulatory offence for organisations

Consequences of Failure

• For organisations: CQC enforcement action
• For individual professionals: GMC/NMC fitness-to-practice proceedings; erasure from the register in serious cases
• For the healthcare system: Erosion of patient trust

Summary: The "LEARN" Framework for Candour

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Q.4a (10 Marks)

Acute Limb Ischaemia

Definition

Aetiology

Clinical Features — The 6 P's

Rutherford Classification (Bailey & Love 28th Ed)

Investigations

1. Ankle-Brachial Index (ABPI): Not usually possible (<0.3 or zero)
2. Duplex Doppler ultrasonography: Identifies level of occlusion; non-invasive; cannot visualize aorta well
3. CT angiography (CTA): First-line imaging; rapid, widely available; shows level and extent of occlusion; identifies embolus (abrupt cut-off) vs. thrombosis (irregular vessel disease)
4. Conventional arteriography: If thrombolysis planned; allows intra-arterial intervention simultaneously
5. ECG: AF, recent MI (embolic source)
6. Echocardiography: Cardiac thrombus, valvular disease, ventricular wall motion abnormality
7. FBC, U&E, coagulation screen, creatine kinase (CK): CK markedly elevated in rhabdomyolysis
8. Cross-match blood
9. ABG: Metabolic acidosis in severe ischaemia

Management

Immediate Resuscitation

• IV access, fluid resuscitation
• Analgesia (IV opioid)
• Anticoagulation: IV unfractionated heparin — 5000 units IV bolus immediately, then infusion — prevents clot propagation and thrombosis of collaterals; does not lyse clot

Surgical Management

• Performed under local anaesthesia if patient is high-risk
• Fogarty balloon embolectomy catheter:
  • Groin incision; expose CFA, SFA and DFA
  • Longitudinal or transverse arteriotomy on CFA
  • Insert Fogarty catheter (2F distal, 3F/4F proximal); pass beyond the clot; inflate balloon; withdraw catheter while maintaining balloon inflation → clot extraction
  • Repeat proximally and distally until good flow achieved
  • Completion angiogram (on-table) to confirm clearance
  • Arteriotomy closed with vein patch or primarily
• For aortic saddle embolus: bilateral groin embolectomy

• When embolectomy alone is insufficient (underlying stenosis)
• Vein bypass (long saphenous vein graft — gold standard) from a proximal to a distal healthy vessel
• Prosthetic (PTFE/Dacron) if vein unavailable (lower patency, infection risk)
• Common bypasses: Femoro-popliteal, femoro-distal

• Intra-arterial catheter-directed thrombolysis (CDT)
• Tissue plasminogen activator (tPA/alteplase) or streptokinase infused via catheter embedded in the clot
• Arteriograms at 6–12 hourly intervals to assess progress
• Takes up to 24 hours
• Advantage: Uncovers underlying stenosis that can then be treated by PTA/stenting
• Contraindications: Recent stroke, bleeding diathesis, active peptic ulcer, pregnancy, recent surgery, hypertension

• Minimally invasive; aspiration of clot through catheter
• Used as adjunct to thrombolysis or standalone

• Essential after revascularisation of prolonged ischaemia (>6 hours)
• Reperfusion oedema causes compartment syndrome → further ischaemia and nerve damage
• All 4 compartments of the calf decompressed through medial and lateral incisions
• Wounds left open → secondary closure or split skin graft at 48–72 hours

Post-operative Complications

• Compartment syndrome (treat with fasciotomy)
• Reperfusion injury: Release of oxygen free radicals, lactic acid, myoglobin, K⁺ from ischaemic muscle → systemic inflammatory response, ARDS, AKI (myoglobinuria — "cola-coloured urine") → requires aggressive IV hydration, urine alkalinization, dialysis if needed
• Rhabdomyolysis and renal failure: Myoglobin precipitates in renal tubules
• Cardiac complications: Hyperkalaemia on reperfusion → arrhythmias; myocardial ischaemia
• Re-occlusion: Requires re-embolectomy or revision
• Wound infection / lymphocoele
• Amputation if irreversible or failed revascularisation

Special Situation: Phlegmasia Cerulea Dolens

• Massive iliofemoral DVT → venous outflow obstruction → arterial compromise
• Limb intensely painful, blue/purple, massively swollen
• Requires urgent venous thrombectomy or catheter-directed thrombolysis + anticoagulation

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Q.4b (10 Marks)

Blast Injuries

Definition

Physics of an Explosion

1. Blast overpressure wave: High-pressure wave (positive phase) followed by a brief negative pressure phase (suction)
2. Blast wind: Mass movement of air behind the pressure wave
3. Heat: Thermal injury
4. Fragmentation: Metal casing, shrapnel, secondary debris
5. Ground shock/cratering: Underground blast

Classification — The Four Mechanisms of Blast Injury

Primary Blast Injury

• Caused by: The blast overpressure wave itself
• Affects organs containing air/gas-fluid interfaces: lungs, ears, GIT, sinuses
• Mechanism: Spallation (sudden deceleration at a gas-liquid interface causing tearing), implosion (gas bubbles collapse), inertia
• Injuries:
  • Blast lung (pulmonary barotrauma): Bilateral pulmonary contusions, haemorrhage, pneumothorax, haemothorax, air emboli; most common cause of death from primary blast injury; presents with haemoptysis, hypoxia, ARDS; CXR shows bilateral "butterfly" infiltrates
  • Blast ear (most common primary blast injury): Tympanic membrane rupture → conductive hearing loss; TM perforation occurs at >5 psi; permanent sensorineural hearing loss possible
  • Blast gut: Bowel perforation (air-containing bowel most vulnerable); colonic injury most common; delayed presentations (up to 48 hours); peritonitis; small bowel injuries may have delayed presentation
  • Ocular: Globe rupture, retinal detachment, traumatic iritis

Secondary Blast Injury

• Caused by: Fragmentation — projectiles from the casing of the device (primary fragmentation) or energised environmental debris (secondary fragmentation): metal, glass, gravel, nails
• Injuries: Penetrating trauma — multiple fragment wounds to any body part; may be dispersed over the body at variable depths; soft tissue lacerations, fractures, arterial/venous injuries, ocular penetration
• Most common cause of blast injury overall
• Management: Wound exploration, fragment removal (if superficial), contaminated wounds left open, antibiotics, tetanus prophylaxis

Tertiary Blast Injury

• Caused by: Blast wind — displacement and throwing of the victim's body against solid objects (or structural collapse falling on the victim)
• Injuries: Blunt trauma — traumatic brain injury, spinal fractures, long bone fractures, crush syndrome, traumatic amputations; similar to high-energy MVA injuries

Quaternary Blast Injury

• Caused by: All other blast-related injuries not in the first three categories
• Includes:
  • Burns (thermal flash, fires ignited by blast)
  • Inhalation injury (combustion products, CO, CN, toxic chemical or biological agents)
  • Crush syndrome (structural collapse)
  • Radiation exposure (dirty bomb/nuclear)
  • Toxic exposure (chemical/biological agents)
  • Exacerbation of pre-existing conditions (MI, COPD exacerbation from blast stress)
  • Psychologic trauma (PTSD)

Quinary Blast Injury (modern addition)

• Hyperinflammatory state from biological, chemical, or radiological agents incorporated into the device ("dirty bomb")

Special Situations

Blast Lung — Management Priority

• High index of suspicion in all blast victims, even if initially asymptomatic
• Can be masked by other injuries
• All blast-exposed patients should have supplemental oxygen
• CXR ± CT chest
• Avoid positive pressure ventilation if possible (risk of air emboli, pneumothorax)
• If intubation required: low tidal volumes, high PEEP; caution with nitrous oxide
• Prophylactic bilateral chest drains in intubated blast lung patients

Management Principles

Pre-hospital

• MARCH algorithm: Massive haemorrhage, Airway, Respiration, Circulation, Hypothermia
• Tourniquets for traumatic amputations and limb haemorrhage (Combat Application Tourniquet)
• Haemostatic dressings for non-compressible wounds
• Careful extraction from structural collapse (avoid secondary injury)

Emergency Department — ATLS Approach

• Primary survey: ABCDE
• C-spine immobilization if any blunt mechanism
• Two large-bore IVs; aggressive fluid resuscitation (permissive hypotension for penetrating injuries: SBP 80–90 mmHg until haemostasis)
• Massive transfusion protocol (MTP): 1:1:1 ratio of packed RBC:FFP:platelets
• Tranexamic acid (TXA): 1 g IV within 3 hours of injury (CRASH-2 trial evidence — reduces mortality from haemorrhage)
• Secondary survey: Head-to-toe examination; log-roll; identify all fragment entry wounds

Surgical Management

• Damage control surgery (DCS): For physiologically compromised patients (hypothermia, acidosis, coagulopathy — "lethal triad"):
  1. Step 1: Haemorrhage and contamination control (laparotomy/thoracotomy); temporary measures; abdominal packing
  2. Step 2: ICU resuscitation (warming, correction of coagulopathy)
  3. Step 3: Definitive repair (24–72 hours later)
• Wounds:
  • All blast wounds are contaminated and should be left open initially (delayed primary closure at 3–5 days)
  • Thorough debridement of devitalised tissue
  • Irrigate copiously
  • Antibiotics: co-amoxiclav or cefuroxime + metronidazole; broader cover for heavily contaminated
  • Tetanus prophylaxis
• Traumatic amputation:
  • Guillotine-type (clean) or ragged (shrapnel)
  • Cover residual limb; revise at 48–72 hours
  • Early liaison with rehabilitation/prosthetics team
• Burns: Standard burns management; resuscitation (Parkland formula if >15% TBSA); escharotomy if circumferential

Special Blast-Related Conditions

• Prolonged compression of muscle mass → rhabdomyolysis on release
• Massive fluid resuscitation before extrication to prevent hyperkalaemia/cardiac arrest on release
• Aggressive IV hydration (target urine output ≥200 mL/hr); urine alkalinization; dialysis if AKI

• Primary: Coup/contrecoup from blast wave; cerebrovascular injury; diffuse axonal injury from acceleration-deceleration
• Secondary: Hypoxia, hypotension, cerebral oedema, raised ICP
• Management: Avoid hypoxia (SaO2 >95%), hypotension (SBP >90), hyperthermia, hypoglycaemia, raised ICP; neurosurgical intervention for haematoma

Summary Table — Blast Injury Mechanisms

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• Q.1 (30 marks): Tumour markers of genitourinary system + Aetiopathology, staging, presentation and management of renal malignancies
• Q.2 (30 marks): Aetiopathology, presentation and management of chest trauma
• Q.3 (20 marks): (a) Urinary bladder diverticula (b) Lower urinary tract symptoms (LUTS)
• Q.4 (20 marks): (a) Synergistic spreading gangrene (b) Spina bifida

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MS General Surgery Year-1 — September 2025

Complete Answers According to Weightage

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Q.1 (30 Marks)

Tumour Markers of Genitourinary System + Aetiopathology, Staging, Presentation and Management of Renal Malignancies

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PART A: TUMOUR MARKERS OF THE GENITOURINARY SYSTEM

1. Prostate-Specific Antigen (PSA)

• Free PSA / Total PSA ratio: A free:total ratio <10% suggests malignancy; >25% suggests BPH. PSA in cancer is predominantly complexed (bound)
• PSA density (PSAD): PSA/prostate volume (ultrasound); PSAD >0.15 ng/mL/cm³ suggests malignancy
• PSA velocity: Rate of rise >0.75 ng/mL/year is suspicious for cancer
• PSA doubling time (PSADT): Post-treatment; short PSADT (<3 months) indicates aggressive recurrence
• Age-specific PSA ranges:
  • 40–49 yrs: <2.5 ng/mL
  • 50–59 yrs: <3.5 ng/mL
  • 60–69 yrs: <4.5 ng/mL
  • 70–79 yrs: <6.5 ng/mL

2. Alkaline Phosphatase (ALP)

• Elevated in prostatic cancer with bone metastases (osteoblastic lesions)
• Non-specific; also elevated in liver disease, Paget's disease

3. Alpha-Fetoprotein (AFP)

4. Human Chorionic Gonadotrophin — Beta (β-hCG)

5. Lactate Dehydrogenase (LDH)

• Non-specific marker reflecting tumour bulk and proliferative rate
• Elevated in advanced testicular germ cell tumours
• Incorporated into the International Germ Cell Cancer Collaborative Group (IGCCCG) prognostic classification for staging
• Also elevated in haemolysis, myocardial infarction, liver disease

6. Placental Alkaline Phosphatase (PLAP)

• Glycoprotein isoenzyme
• Elevated in seminoma (70% of cases)
• Limited clinical utility alone (high false positive rate in smokers)
• Used as a marker for seminoma in patients with normal AFP and β-hCG

7. Neuron-Specific Enolase (NSE)

• Elevated in some seminomas and in neuroendocrine tumours of the bladder/kidney
• Used as supplementary marker

8. Carcinoembryonic Antigen (CEA)

• Non-specific; may be elevated in bladder and transitional cell carcinoma (TCC)
• Mainly used for colorectal cancer; limited role in genitourinary malignancies

9. CA 125

• Elevated in renal cell carcinoma and upper tract urothelial carcinoma (less commonly)
• Primary use is ovarian cancer

10. Chromogranin A & B

• Markers for neuroendocrine/carcinoid tumours of the kidney and bladder
• Also elevated in CRPC (castration-resistant prostate cancer) with neuroendocrine differentiation

11. Urinary Markers for Bladder Cancer

12. Summary Table — Key GU Tumour Markers

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PART B: RENAL MALIGNANCIES — AETIOPATHOLOGY, STAGING, PRESENTATION AND MANAGEMENT

Classification of Renal Malignancies

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RENAL CELL CARCINOMA (RCC)

Epidemiology (Campbell-Walsh-Wein)

• 2–3% of all adult malignant neoplasms; most lethal of common urological cancers
• ~64,000 new cases/year in the USA; 14,400 deaths/year
• Male:female ratio = 1.9:1
• Peak incidence: 55–75 years (though rising in <40 years)
• 40% of patients die of disease

Aetiopathology

• Tobacco smoking (relative risk 1.4–2.5; dose-dependent; accounts for ~30% of cases)
• Obesity (positive correlation; adipokines, insulin resistance, oestrogen excess)
• Hypertension (independent risk factor; also the antihypertensive drugs — diuretics debated)
• Acquired polycystic kidney disease (secondary to chronic dialysis — 30-fold increased risk)
• Occupational exposures: Cadmium, trichloroethylene, asbestos
• Analgesic abuse (phenacetin)
• Family history: 4–6% are familial; autosomal dominant syndromes

• Von Hippel-Lindau (VHL) disease: AD; germline VHL mutation (chr 3p25); bilateral/multifocal clear cell RCC in 40–60%; also cerebellar/retinal haemangioblastomas, phaeochromocytoma, pancreatic cysts
• Hereditary papillary RCC: AD; germline activating MET mutation; bilateral, multifocal papillary type I
• Birt-Hogg-Dubé (BHD): AD; folliculin gene (chr 17p); chromophobe RCC, oncocytoma, hybrid tumours + fibrofolliculomas + lung cysts/pneumothorax
• Hereditary leiomyomatosis RCC (HLRCC): AD; fumarate hydratase mutation; papillary type II (aggressive); skin/uterine leiomyomas
• Cowden syndrome: AD; PTEN mutation; 34% lifetime risk of papillary RCC

• VHL protein forms an E3 ubiquitin ligase complex → ubiquitinates HIF-1α and HIF-2α → proteasomal degradation (under normoxic conditions)
• Loss of VHL → HIF-1α/2α accumulate even under normoxia ("pseudohypoxia")
• HIF transcription → upregulation of VEGF (angiogenesis), PDGF (stroma), TGF-α (proliferation), GLUT1 (glucose uptake), erythropoietin (EPO — explains paraneoplastic polycythaemia)
• This makes VEGF/mTOR pathways the primary targets for systemic therapy

• Spherical mass arising from cortex; golden yellow on cut section (lipid-rich, glycogen-rich clear cells)
• Pseudocapsule (compressed renal parenchyma)
• Central necrosis and haemorrhage in larger tumours
• Characteristic renal vein extension (clear cell): tumour thrombus propagates up IVC → right atrium (in 4–10%)
• Satellite nodules; multilocularity in hereditary forms

• Clear cell: Cells with clear/pale cytoplasm (lipid, glycogen dissolved in processing); arranged in nests/sheets; rich sinusoidal vasculature; Fuhrman nuclear grade (1–4) / WHO/ISUP grade
• Papillary: Papillary or tubular architecture; fibrovascular cores with foamy macrophages; psammoma bodies; haemosiderin deposits
• Chromophobe: Large cells with eosinophilic, finely reticular cytoplasm; plant cell appearance; perinuclear halo; Hale's colloidal iron staining positive

Staging — TNM Classification (AJCC/UICC 8th Edition)

• N0: No regional lymph node metastasis
• N1: Regional lymph node metastasis

• M0: No distant metastasis
• M1: Distant metastasis

Clinical Presentation

1. Haematuria (gross — 60% of symptomatic cases; most common symptom)
2. Loin pain (dull ache due to capsular stretching or haemorrhage)
3. Palpable abdominal mass (usually indicates advanced disease)

• Bone pain, pathological fracture (osteolytic metastases — 30%)
• Pulmonary symptoms: cough, haemoptysis ("cannonball" lung metastases)
• Neurological symptoms: headache, seizures (brain metastases)
• Left-sided varicocoele (right-sided renal vein or IVC thrombosis obstructing left gonadal vein drainage — does not empty on lying supine)

Investigations

1. Urine:
   • Urinalysis: Haematuria (micro or macro)
   • Urine cytology (important for renal pelvis TCC)
2. Blood:
   • FBC: Polycythaemia (ectopic EPO) or anaemia (chronic disease, haemorrhage)
   • Calcium: Hypercalcaemia (paraneoplastic)
   • LFTs, ALP: Stauffer syndrome, hepatic metastases
   • ESR/CRP: Elevated as non-specific
   • Serum creatinine: Baseline renal function
3. Imaging:
   • Ultrasound (USS): First-line; distinguishes cystic from solid lesions; Bosniak classification of renal cysts
     • Bosniak I/II: Benign (simple/minimally complex cysts)
     • Bosniak IIF: Follow-up
     • Bosniak III/IV: Surgical (III — 50% malignant; IV — >90% malignant)
   • CT (multiphase — gold standard): Confirms enhancement (>15 Hounsfield Units = malignant); assesses local invasion, LN, adrenal involvement, IVC thrombus, contralateral kidney; staging
   • MRI: Superior for IVC thrombus extent; renal vein/IVC involvement; equivocal CT lesions; no radiation
   • CXR/CT chest: Pulmonary metastases ("cannonball" metastases)
   • Bone scan: If elevated ALP or bone pain
   • CT/MRI brain: If neurological symptoms
   • Renal arteriography: If partial nephrectomy planned (complex tumours); pre-embolization
4. Biopsy:
   • CT/USS-guided percutaneous renal biopsy: For small renal masses where systemic therapy planned, or for histological confirmation before ablation; for metastatic disease (avoids nephrectomy if lymphoma/metastasis)
   • Accuracy >90%; risk of seeding <0.01%

Management

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• Surgical removal of kidney, perirenal fat, Gerota's fascia, ipsilateral adrenal (unless normal on imaging), regional lymph nodes
• Indications: T2 tumours, multifocal tumours, tumours in a normal contralateral kidney where nephron-sparing is not feasible
• Approaches: Open (flank, transperitoneal, or thoracoabdominal), laparoscopic (standard of care), robot-assisted
• IVC thrombectomy if vena caval extension (T3b/c): Combined urological/vascular/cardiac surgery; may require cardiopulmonary bypass for level IV (supradiaphragmatic) thrombus

• Indications: T1a (≤4 cm) — preferred over radical nephrectomy; T1b when technically feasible; imperative nephron-sparing indications: solitary kidney, bilateral tumours, hereditary RCC, pre-existing CKD, contralateral kidney at risk
• Goal: Negative surgical margins; preserve maximal renal parenchyma
• Approaches: Open, laparoscopic, robotic-assisted (da Vinci)
• Oncological outcomes equivalent to radical nephrectomy for T1 tumours
• Reduced risk of CKD, cardiovascular events

• Radiofrequency ablation (RFA): US/CT-guided; 90–100°C; protein coagulation; probe placed in tumour
• Cryoablation: Freeze-thaw cycles (-40°C); ice ball formation; direct cell death + vascular thrombosis
• High-intensity focused ultrasound (HIFU): Emerging
• Recurrence rates slightly higher than surgery; suitable for elderly/comorbid patients

• For T1a (<3 cm), elderly patients, significant comorbidities
• Serial imaging (USS or CT/MRI) every 3–6 months
• Intervention if >3 cm or growth rate >5 mm/6 months

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• Radical nephrectomy + IVC thrombectomy (T3b/c)
• Role of adjuvant targeted therapy: Pembrolizumab (PD-1 inhibitor) — KEYNOTE-564 trial — FDA-approved adjuvant therapy for high-risk clear cell RCC (T3/T4, N1, M1 with no evidence of disease after resection; or grade 4 disease)
• Pre-operative embolization for highly vascular tumours

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• Historically, RCC was chemotherapy-resistant
• Cytoreductive nephrectomy (CN): Removal of primary tumour in setting of metastatic disease; improves survival when combined with immunotherapy in selected patients (CARMENA trial has refined patient selection)

• High-dose IL-2: 5–15% complete response; toxic; reserved for selected patients
• IFN-α: Low response rates; now replaced

• Sunitinib (oral TKI — inhibits VEGFR, PDGFR, c-Kit): First-line for clear cell mRCC; PFS ~11 months
• Pazopanib (oral TKI): Equivalent to sunitinib; non-inferior; COMPARZ trial
• Sorafenib (VEGFR, RAF kinase inhibitor): Second-line after cytokines
• Axitinib (more potent, selective VEGFR TKI): Second-line
• Bevacizumab (anti-VEGF antibody) + IFN-α: Alternative first-line

• Everolimus (oral mTOR inhibitor): Second-line after VEGF TKI failure; poor-risk mRCC
• Temsirolimus (IV mTOR inhibitor): Poor-risk, first-line

• Nivolumab (PD-1 inhibitor): Second-line mRCC; superior OS over everolimus (CheckMate 025)
• Combination regimens — current first-line standard:
  • Nivolumab + Ipilimumab (PD-1 + CTLA-4): CheckMate 214 — superior for intermediate/poor-risk patients; 42% ORR
  • Pembrolizumab + Axitinib (PD-1 + VEGFR TKI): KEYNOTE-426 — superior PFS and OS vs. sunitinib; now preferred first-line
  • Nivolumab + Cabozantinib: CheckMate 9ER — superior PFS/OS vs. sunitinib
  • Lenvatinib + Pembrolizumab: CLEAR trial — highest ORR (~70%)

• IMDC (International Metastatic RCC Database Consortium — Heng criteria): 6 adverse factors: <1 year from diagnosis to treatment, KPS <80, anaemia, thrombocytosis, neutrophilia, hypercalcaemia
  • Favourable (0 factors): Median OS ~43 months
  • Intermediate (1–2 factors): Median OS ~23 months
  • Poor (≥3 factors): Median OS ~8 months

• Surgical resection of isolated metastases (particularly single lung, brain, bone) can improve survival in selected patients

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UROTHELIAL CARCINOMA OF THE RENAL PELVIS

• 7–10% of renal tumours; transitional cell carcinoma (TCC)
• Risk factors: Smoking (most important), analgesic abuse (phenacetin), Balkan nephropathy, aristolochic acid (herbal), occupational (aniline dyes)
• Presentation: Painless haematuria, flank pain, obstruction
• Diagnosis: CT urogram (hydronephrosis, filling defect), urine cytology, ureteroscopy + biopsy
• Treatment: Nephroureterectomy (radical) with bladder cuff removal; adjuvant cisplatin-based chemotherapy (same as urothelial bladder cancer)

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Q.2 (30 Marks)

Aetiopathology, Presentation and Management of Chest Trauma

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Definition and Epidemiology

• Accounts for ~25% of trauma deaths; contributes to an additional 25% of deaths
• Blunt trauma (70–80%): Road traffic accidents (RTAs), falls, assaults, crush injuries
• Penetrating trauma (20–30%): Stab wounds, gunshot wounds
• Up to 85% of chest injuries can be managed non-operatively

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Classification of Chest Injuries

Immediately Life-Threatening ("Lethal Six" — ATLS)

1. Airway obstruction
2. Tension pneumothorax
3. Open chest wound (sucking chest wound)
4. Massive haemothorax
5. Flail chest
6. Cardiac tamponade

Potentially Life-Threatening ("Hidden Six")

1. Simple pneumothorax
2. Haemothorax
3. Pulmonary contusion
4. Tracheobronchial disruption
5. Blunt cardiac injury (myocardial contusion)
6. Traumatic aortic disruption
7. Diaphragmatic tear
8. Oesophageal rupture

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AETIOPATHOLOGY

Blunt Chest Trauma

• Direct impact: Compression of thoracic cage → rib fractures, sternal fractures, organ contusion
• Deceleration injury: Differential deceleration of structures attached at fixed points → tearing of aorta at the aortic isthmus (ligamentum arteriosum), tracheobronchial tears
• Compression injury: Sudden rise in intrathoracic pressure → rupture of diaphragm, alveolar burst, cardiac contusion
• Contre-coup injury: Injury remote from the impact site

1. Pain → splinting → reduced respiratory excursion → atelectasis → pneumonia
2. Lung contusion → capillary leak → interstitial and alveolar haemorrhage → ventilation-perfusion mismatch → hypoxia
3. Rib fractures → paradoxical respiration (flail chest) → ineffective ventilation
4. Haemorrhage into pleural space → haemothorax → lung compression, shock
5. Air leak → pneumothorax → lung collapse, mediastinal shift

Penetrating Chest Trauma

• Stab wounds: low velocity; local injury; pneumo/haemothorax; cardiac tamponade (especially anterior wounds between MCL and parasternal)
• Gunshot wounds: high velocity; cavitation and blast effect; widespread tissue destruction; sucking chest wounds

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SPECIFIC INJURIES — AETIOPATHOLOGY AND MANAGEMENT

1. Rib Fractures

• Most common chest injury (>50% of blunt trauma)
• Fractured by direct impact or indirect (compression)
• First and second ribs (protected by clavicle, scapula) → require significant force → associated with great vessel injury, brachial plexus injury
• Ribs 4–9: Most commonly fractured
• Lower ribs (10–12): Associated with liver, spleen, and kidney injuries

• Pain → splinting → atelectasis → pneumonia
• Pneumothorax, haemothorax, pulmonary contusion
• Injury to subclavian/axillary vessels (1st/2nd rib)
• Flail chest (≥3 ribs fractured in ≥2 places)

• Adequate analgesia (MOST IMPORTANT): IV opioids, NSAIDs, regional blocks (intercostal nerve block, epidural analgesia, paravertebral block — preferred for multiple rib fractures), intrapleural local anaesthetic
• Incentive spirometry, physiotherapy, deep breathing exercises
• Treat associated pneumo/haemothorax
• Intercostal nerve blocks: 0.5% bupivacaine at the posterior angle of each fractured rib — superior to systemic analgesia
• Surgical rib fixation: For severe flail chest with respiratory failure not responding to ventilation, for painful non-union, for open chest trauma; metal plates and screws

2. Flail Chest

• Three or more ribs fractured in two or more places → a free-floating segment
• Paradoxical movement: Free segment moves inward on inspiration, outward on expiration — opposite to the rest of the chest wall
• Results in: ineffective ventilation, increased work of breathing, pendulum air movement between the two lungs
• Underlying pulmonary contusion is the major cause of respiratory failure (not just the paradoxical movement)

• Visible paradoxical movement of the chest wall segment
• Hypoxia, tachypnoea, respiratory distress
• Crepitus, subcutaneous emphysema

• Supplemental O2
• Adequate analgesia (epidural preferred)
• Key decision: Intubation and positive pressure ventilation (IPPV) if:
  • SpO2 <90% on O2
  • RR >35 breaths/min
  • PaO2 <60 mmHg, PaCO2 >55 mmHg
  • Significant associated injuries
• Internal pneumatic stabilisation (IPPV provides "internal splinting")
• Surgical fixation: When prolonged ventilation anticipated (>72 hours), when thoracotomy is performed for other reasons, failed extubation, delayed presentation with non-union
• Rib fixation improves outcomes: Reduces ventilator days, ICU stay, and incidence of pneumonia (RACS and recent RCTs)

3. Pneumothorax

• Air in the pleural space from laceration of lung or chest wall
• Collapsed lung; absent breath sounds; hyperresonance
• Management: Intercostal drain (ICD) insertion — 2nd intercostal space MCL (for air) or 4th/5th ICS anterior axillary line (AAL) — "safe triangle" (anterior: lateral border pectoralis major; posterior: lateral border latissimus dorsi; superior: base of axilla; inferior: horizontal line through the nipple)
• Small, asymptomatic: Aspiration or observation

• Air enters the pleural space via a one-way valve mechanism but cannot escape → progressive accumulation → increasing intrathoracic pressure → mediastinal shift away from the affected side → compression of the heart and great vessels → reduced cardiac output → circulatory collapse

• Increased intrathoracic pressure on affected side
• Mediastinal shift → kinking of IVC → impaired venous return → reduced cardiac output
• Contralateral lung compressed → worsening hypoxia
• Rapidly fatal if untreated

• Respiratory distress, tachypnoea
• Hypoxia, cyanosis
• Hypotension, tachycardia → haemodynamic collapse
• Deviated trachea (away from the affected side — late sign)
• Distended neck veins (elevated JVP — may be absent in hypovolaemia)
• Absent breath sounds on affected side
• Hyperresonance on percussion

1. Immediate needle decompression: 14/16-gauge cannula, 2nd ICS, MCL — life-saving emergency procedure
2. Followed immediately by ICD (needle decompression is temporary)
3. High-flow oxygen

• Large chest wall defect (>2/3 of tracheal diameter) → air preferentially enters through the wound (less resistance than trachea)
• Lung collapses on ipsilateral side; mediastinal shift possible

1. Three-sided occlusive dressing (Asherman chest seal): Seals three sides → acts as one-way valve → allows air to escape on expiration but prevents entry on inspiration
2. ICD insertion (away from the wound)
3. Definitive surgical closure of the wound

4. Haemothorax

• Blood in the pleural cavity from lacerated chest wall vessels (intercostal arteries — most common), lung parenchyma, great vessels, or heart
• Dullness to percussion, absent breath sounds
• Associated hypovolaemia if >500 mL

• 1500 mL blood in the pleural cavity (or >200 mL/hour drainage for 2–4 hours)

• Causes: Laceration of systemic vessels (aorta, subclavian, IMA), pulmonary hilum, cardiac injury
• Clinical: Haemodynamic instability + absent breath sounds + dullness on affected side + distended neck veins absent (differentiates from cardiac tamponade)

1. Two large-bore IVs; aggressive fluid/blood resuscitation
2. ICD (large bore — 32–36 Fr) — placed in the 4th/5th ICS, AAL
3. Autotransfusion (blood from ICD → autotransfuser → patient) — valuable in massive haemothorax
4. Thoracotomy indicated when:
   • Immediate drainage >1500 mL
   • Continued drainage >200 mL/hour for 2–4 hours
   • Haemodynamic instability despite resuscitation
   • Clotted haemothorax (video-assisted thoracoscopic surgery — VATS — preferred)

5. Cardiac Tamponade

• Blood accumulates in the pericardial sac (typically 200–250 mL acutely → rapid accumulation → increase in pericardial pressure → compression of cardiac chambers → reduced filling → reduced cardiac output)
• Caused by: Penetrating anterior chest wounds (between clavicles and costal margins), blunt cardiac trauma
• Pericardium is non-compliant acutely → even small volumes significantly ↑ pressure

1. Hypotension (↓ cardiac output)
2. Muffled/distant heart sounds (blood around heart)
3. Raised JVP/distended neck veins (↑ venous pressure)

1. Pericardiocentesis (emergency decompression): Subxiphoid approach (Marfan/Beck approach); 18-gauge long needle; insert at 45° angle aimed at left shoulder; aspirate blood; even aspiration of 10–15 mL produces dramatic haemodynamic improvement — temporary measure
2. Emergency thoracotomy (definitive): For penetrating trauma — repair of cardiac laceration
3. Pericardial window (surgical): Subxiphoid or transpleural pericardial decompression — definitive; allows drainage

6. Pulmonary Contusion

• Blunt trauma → direct parenchymal injury → capillary rupture → interstitial and alveolar haemorrhage and oedema → consolidation → ↑ pulmonary vascular resistance → V/Q mismatch → hypoxia
• Most common lethal chest injury
• Occurs under the point of impact; may worsen over 24–48 hours
• May be present without rib fractures (especially in children — elastic chest wall)

• Hypoxia (may be subtle initially)
• Haemoptysis
• Reduced air entry in affected area
• CXR: Initially may be clear → consolidation develops over 24 hours
• CT chest: More sensitive; shows contusion immediately

• High-flow O2
• Analgesia (epidural preferred)
• Fluid restriction (avoid overload — worsens oedema)
• Physiotherapy, incentive spirometry
• Avoid excessive crystalloid resuscitation
• Ventilatory support if severe:
  • Non-invasive ventilation (BiPAP/CPAP) for mild-moderate
  • Intubation + IPPV with PEEP for severe (SpO2 <90%)
  • Protective ventilation: Low tidal volume (6 mL/kg IBW), PEEP 5–10 cmH2O

7. Traumatic Aortic Injury (TAI)

• Deceleration injury (RTAs, falls from height) → differential shear forces at fixed points
• Most common site: Aortic isthmus (descending aorta just distal to origin of left subclavian artery, at ligamentum arteriosum — transitional zone between the relatively mobile aortic arch and the fixed descending aorta)
• Tears: Intimal → partial-thickness → full-thickness → rupture
• 80–90% die at scene; only 10–15% reach hospital alive
• Contained rupture → mediastinal haematoma (keeps patient alive temporarily)

• Often no external signs
• CXR findings (mediastinal haematoma):
  • Widened mediastinum (>8 cm at aortic knob)
  • Indistinct aortic knob
  • Left apical cap
  • Left haemothorax
  • Deviated trachea/NG tube to the right
  • Depressed left main bronchus

• CT aortography (gold standard): Defines injury grade (Society for Vascular Surgery grade I–IV)
• Transoesophageal echocardiography (TOE): If CT unavailable
• Conventional aortography: Pre-intervention

• Anti-impulse therapy: IV beta-blocker (labetalol/esmolol) to reduce heart rate (<80 bpm) and systolic BP (<100 mmHg) → reduces aortic wall stress while preparing for intervention
• Thoracic endovascular aortic repair (TEVAR): Now first-line treatment; endovascular stent graft deployed via femoral artery approach; lower mortality than open surgery; reduced paraplegia risk
• Open surgical repair: Reserved for anatomy not suitable for TEVAR (young patients, inadequate landing zone)

8. Tracheobronchial Disruption

• Blunt: Compression of trachea against spine during sudden deceleration; most common location is within 2.5 cm of the carina
• Penetrating: Direct laceration
• Results in: Massive air leak, tension pneumothorax, surgical emphysema, haemoptysis

• Persistent massive air leak despite ICD (hallmark)
• Surgical emphysema — can be massive
• Tension pneumothorax
• Haemoptysis
• Voice change, hoarseness (laryngotracheal)

• Secure airway urgently (anaesthetic input)
• If intubating — FOB-guided intubation; avoid instrumenting the disrupted area
• ICD for pneumothorax
• Bronchoscopy: Confirms diagnosis and defines extent
• Surgical repair (thoracotomy): Primary repair of the disruption; urgent

9. Diaphragmatic Injury

• Blunt: Left side more commonly (80%) — right lobe of liver protects; sudden ↑ intraabdominal pressure → rupture (left diaphragm has a natural weakness at embryonic fusion zones)
• Penetrating: Either side
• Herniation of abdominal contents (stomach, colon, small bowel, spleen) into the chest → lung compression

• Bowel sounds heard in chest
• CXR: Elevated left hemidiaphragm, NG tube in chest, air-fluid levels in hemithorax
• CT chest/abdomen: Diagnostic

• Surgical repair: Laparotomy (acute — allows reduction of herniated viscera + diaphragm repair); thoracotomy or laparoscopy for chronic/delayed presentation

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PRIMARY SURVEY AND INITIAL MANAGEMENT (ATLS Framework)

Pre-hospital

• Airway management, immobilisation, haemorrhage control
• Permissive hypotension in penetrating trauma (SBP 80–90 mmHg)

Airway (A)

• Inspect for obstruction, bleeding, crepitus
• Position, suction, chin lift/jaw thrust
• RSI intubation if GCS ≤8, failing airway, respiratory distress
• Cricothyroidotomy if cannot intubate

Breathing (B)

• Supplemental O2 (100% via non-rebreather mask)
• Inspect, palpate, percuss, auscultate
• Immediately treat: Tension pneumothorax (needle decompression), open chest wound (3-sided dressing), haemothorax/pneumothorax (ICD)

Circulation (C)

• Two large-bore IVs; blood for crossmatch
• IV fluid resuscitation (warm Hartmann's solution); blood products early
• Massive haemothorax: Autotransfusion
• Cardiac tamponade: Pericardiocentesis
• External haemorrhage control

Disability (D)

• GCS, pupils

Exposure (E)

• Complete exposure; log-roll; inspect back, axillae

Adjuncts

• CXR (erect AP — portable in trauma bay)
• ECG (cardiac contusion, aortic injury, tachy/arrhythmias)
• FAST ultrasound (haemopericardium, haemothorax, intra-abdominal fluid)
• Arterial blood gas (hypoxia, metabolic acidosis)
• CT trauma (after primary survey and haemodynamic stabilisation)

Indications for Emergency Thoracotomy (Emergency Room Thoracotomy — ERT)

Indications for Elective/Urgent Thoracotomy

• Immediate ICD output >1500 mL
• Ongoing blood loss >200 mL/hour for 2–4 hours
• Massive air leak (tracheobronchial injury)
• Oesophageal injury
• Aortic injury (if TEVAR not available)
• Retained clotted haemothorax (VATS preferred)
• Diaphragmatic injury at laparotomy

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Q.3a (10 Marks)

Urinary Bladder Diverticula

Definition

Classification

• Occur at areas of natural anatomical weakness in the bladder wall, particularly adjacent to the ureteric orifices (Hutch diverticula)
• Hutch diverticulum: Occurs posterolateral to the ureteric orifice; congenitally weak detrusor; associated with vesicoureteric reflux (VUR)
• Usually solitary; true diverticula (have some muscle in their wall)
• Occur in infants and children; more common in boys

• Result from long-standing raised intravesical pressure (bladder outlet obstruction — BOO)
• Mucosa herniates through the detrusor muscle between the trabeculations
• The increased intravesical pressure from BOO → hypertrophy of the detrusor → formation of trabeculations and cellules → eventually break through as diverticula
• These are false diverticula (no muscle in the wall — only mucosa and submucosa)
• Usually multiple; distributed throughout the bladder
• Common causes of BOO: Benign prostatic hyperplasia (BPH), urethral stricture, bladder neck contracture, neurogenic bladder (detrusor-sphincter dyssynergia)

Pathophysiology

• The diverticulum opens into the bladder through a narrow neck
• Urine enters but is not expelled during voiding (inefficient contraction of the thin, muscle-free wall)
• Stasis → urinary infection (UTI), stone formation, mucosal metaplasia → carcinoma
• Large diverticula can compress adjacent structures (ureter → hydronephrosis; urethra → retention)
• VUR may occur if the diverticulum is adjacent to the ureteric orifice

Clinical Presentation

• Asymptomatic (incidental finding on imaging — most common)
• Double micturition (passage of urine in two streams or the patient urinates, then has to urinate again immediately as diverticulum empties back into bladder)
• Incomplete bladder emptying → urinary frequency, nocturia
• Recurrent UTIs (E. coli most common)
• Haematuria (UTI, stone, or — most importantly — tumour within the diverticulum)
• Lower abdominal mass (large diverticulum)
• Acute urinary retention

• Lower abdominal mass (large diverticulum)
• Cystoscopy: Neck of the diverticulum seen; endoscope can be passed inside
• Prostatic enlargement on DRE (BPH as cause)

Investigations

1. Urine analysis and MSU (to identify infection)
2. Cystoscopy (gold standard): Visualises the ostium; assesses the interior for stones, tumour, trabeculation; biopsies any suspicious mucosa; identifies ureteric orifice proximity
3. Ultrasound: Identifies diverticula, residual urine; avoids radiation; poor at showing relationship to ureters
4. CT cystography/CT urogram (CECT): Delineates size, location, relationship to ureters; identifies complications (stone, tumour, VUR); contrast fills the diverticulum; preferred for large/complex diverticula
5. Micturating cystourethrogram (MCUG): Especially for children (Hutch diverticulum and VUR); shows filling and emptying behaviour; identifies VUR
6. Urodynamics: Assess BOO (especially BPH-associated); detrusor overactivity
7. PSA + DRE: If BPH suspected in men

Complications

Management

1. Treat the underlying cause (BOO) — FIRST and most important
2. Treat complications
3. Diverticulectomy for large/symptomatic diverticula

• Treat UTI (appropriate antibiotics)
• Address underlying BOO: TURP/prostatectomy for BPH, urethrotomy for urethral stricture

• Indications:
  • Large symptomatic diverticula (>5 cm)
  • Recurrent infections not controlled
  • Stone formation within the diverticulum
  • Tumour within the diverticulum (necessitates partial/radical cystectomy)
  • VUR causing hydronephrosis (Hutch diverticulum)
  • Persistent haematuria
  • Urethral/ureteric compression
• Approach:
  • Open: Extraperitoneal or transperitoneal; excision of the diverticulum and closure of the bladder in layers; care to protect the ureter (often stented pre-operatively)
  • Laparoscopic/Robot-assisted: Increasingly performed; lower morbidity
  • Transurethral (endoscopic): Incision of the diverticular neck with a resectoscope (Diverticulotomy) — for small diverticula with narrow necks; simple and minimally invasive
• Pre-operative ureteric stenting: Protects the ureter during excision of diverticula located near the ureteric orifice

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Q.3b (10 Marks)

Lower Urinary Tract Symptoms (LUTS) — Enumerate and Describe

Definition

Classification of LUTS (ICS — International Continence Society Classification)

1. Storage (Irritative) Symptoms

2. Voiding (Obstructive) Symptoms

3. Post-Micturition Symptoms

Assessment of LUTS — International Prostate Symptom Score (IPSS)

• 7 symptom questions (0–5 scale each) + 1 quality of life (QoL) question
• Maximum score: 35 (symptoms) + 6 (QoL)
• Mild LUTS: IPSS 0–7
• Moderate LUTS: IPSS 8–19
• Severe LUTS: IPSS 20–35

Common Causes of LUTS

In Men:

In Women:

• Overactive bladder / detrusor overactivity → storage symptoms
• Stress urinary incontinence (weak pelvic floor, post-partum) → stress incontinence
• Urethral diverticulum → post-micturition dribble
• UTI → storage symptoms + dysuria
• Bladder prolapse (cystocoele) → obstructive symptoms

Investigations for LUTS

1. History: Duration, character of symptoms, fluid intake, medication history, past urological history; IPSS score; bladder diary (frequency-volume chart over 3 days)
2. Physical examination: Abdominal examination (distended bladder); DRE (prostate size, consistency, nodules); neurological examination
3. Urinalysis/MSU: Rule out infection, haematuria, glycosuria
4. PSA: If age >40 years and prostate carcinoma is a concern (after counselling)
5. Serum creatinine/eGFR: Assess renal function (hydronephrosis from chronic retention)
6. Post-void residual (PVR) urine: Ultrasound-measured; >100 mL is significant; >300 mL indicates chronic retention
7. Uroflowmetry: Non-invasive; Qmax (maximum flow rate):
   • Normal: >15–20 mL/s
   • Obstructed: <10 mL/s
   • Equivocal: 10–15 mL/s
8. Urodynamics (cystometry): Gold standard for diagnosing BOO vs. detrusor underactivity vs. OAB; invasive; indicated when diagnosis is uncertain, before surgery for incontinence, failed conservative management
9. Renal/bladder ultrasound: Hydronephrosis (from chronic retention), bladder wall thickness, PVR, stones, tumour
10. Cystoscopy: Suspected bladder tumour, stone, stricture, diverticulum; haematuria with LUTS

Treatment Principles for LUTS

Conservative/Lifestyle:

• Fluid management (avoid excessive intake; reduce evening fluid intake for nocturia)
• Bladder retraining (for OAB — gradually increasing voiding intervals)
• Pelvic floor exercises (for stress incontinence)
• Weight loss, caffeine/alcohol reduction

Medical Treatment:

• Alpha-1 blockers (tamsulosin, alfuzosin, silodosin): Relax smooth muscle in prostate and bladder neck → improved voiding; first-line for BPH-related LUTS; onset 48 hours; do not reduce prostate size
• 5-alpha-reductase inhibitors (5-ARIs) (finasteride, dutasteride): Block conversion of testosterone to DHT → reduce prostate volume by ~20–25%; take 6 months for full effect; reduce PSA by 50%; used for large prostates (>40 mL) or high PSA
• Combination (alpha-blocker + 5-ARI): For large prostates; superior to monotherapy (MTOPS, CombAT trials)
• Antimuscarinics (oxybutynin, tolterodine, solifenacin): For storage/OAB symptoms; inhibit detrusor M2/M3 muscarinic receptors; caution in high PVR (worsen retention)
• Beta-3 agonists (mirabegron): Relaxes detrusor → ↑ bladder capacity; alternative to antimuscarinics; no dry mouth/retention risk
• Phosphodiesterase-5 inhibitors (tadalafil): Licensed for BPH-associated LUTS; also treats erectile dysfunction
• Desmopressin: For nocturnal polyuria → nocturia
• Antibiotics: For UTI-related LUTS

Surgical Treatment:

• TURP (transurethral resection of prostate): Gold standard for BPH; resects prostatic tissue via cystoscope; risk: TUR syndrome (hyponatraemia from glycine absorption — now less with bipolar TURP using saline), retrograde ejaculation (90%), erectile dysfunction (10%)
• Laser prostatectomy (HoLEP — holmium laser enucleation): Superior to TURP for large prostates; less bleeding; can be done on anticoagulants
• TUIP (transurethral incision): For small fibrous bladder neck obstruction
• Open prostatectomy (Millin's — retropubic; Freyer's — suprapubic): For very large prostates (>80–100 mL)
• Urethrotomy/urethroplasty: For urethral stricture
• PFMT + TVT/TOT: For stress urinary incontinence

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Q.4a (10 Marks)

Synergistic Spreading Gangrene (Meleney's Synergistic Gangrene)

Definition

Historical Background

• First described by Frank L. Meleney in 1924
• Distinguished from necrotising fasciitis by the predominance of skin and subcutaneous tissue involvement (fascia usually spared) and the typical clinical evolution

Bacteriology — Synergistic Mechanism

• Anaerobes reduce local pO2 → anaerobic microenvironment for streptococci
• Combined enzyme production (hyaluronidase, collagenase, lecithinase, fibrinolysin) → liquefaction of subcutaneous fat and fascia, thrombosis of perforating vessels → spreading ischaemia

Predisposing Factors

• Post-operative wound (abdominal/perineal surgery most common)
• Diabetes mellitus
• Malignancy
• Immunosuppression (steroids, chemotherapy)
• Malnutrition
• Colostomy/ileostomy wounds
• Following instrumentation of the genitourinary or gastrointestinal tract

Pathology

• Central zone: Frank gangrene (black/dark brown) — full-thickness skin and fat necrosis
• Middle zone: Gangrenous (purple-blue) skin — early necrosis
• Outer zone: Bright red, indurated, oedematous skin — active cellulitis spreading peripherally
• The central black necrosis is surrounded by the characteristic concentric rings of colour change
• Undermining: The necrosis spreads rapidly in the subcutaneous plane; the skin may appear viable but is already separated from the underlying tissue

• Thrombosis of small blood vessels and arterioles
• Extensive infiltration by neutrophils, with progressive necrosis of dermis and subcutaneous fat
• Microorganisms visible in tissue

Clinical Presentation

• Trunk (abdominal wall) — most common
• Perineum, scrotum, vulva
• Extremities (less common)

• Insidious onset; slowly progressive
• Initial wound erythema and mild pain (distinguishes from necrotising fasciitis which has early, severe pain)
• Progressive skin breakdown with central black necrotic area
• Systemic features: Fever, malaise; less septicaemic than NF
• Surrounding skin: Red, oedematous, warm

• Central gangrenous ulcer with characteristic tricolour zones:
  1. Inner black zone — full gangrene
  2. Middle purple zone — impending necrosis
  3. Outer red zone — spreading cellulitis
• Undermining of skin edges (probe can be passed under the skin)
• Serous/seropurulent discharge; no crepitus (unlike clostridial gas gangrene)
• Relatively slow spread (mm per day) cf. NF (cm per hour)

Investigations

1. Wound swabs: Aerobic and anaerobic culture and sensitivity
2. Tissue biopsy (gold standard): Histopathology confirms polymicrobial organisms and vascular thrombosis
3. FBC: Leucocytosis
4. Blood cultures: Often negative (bacteraemia less common than in NF)
5. Blood glucose: Exclude diabetes; HbA1c
6. CRP, ESR, PCT: Inflammatory markers
7. Imaging (XR/CT): Exclude gas in tissues (not typical in Meleney's); CT for deeper involvement, underlying collections

Diagnosis — Differentials

Management

1. Resuscitation

• IV fluids; correct electrolyte abnormalities
• Glycaemic control (insulin infusion if diabetic)
• Nutritional support (NG/TPN) — essential for wound healing

2. Antibiotics (Broad-spectrum, IV, polymicrobial cover)

• First-line regimen:
  • Piperacillin-tazobactam (covers Gram-negative aerobes and anaerobes) +
  • Metronidazole (or clindamycin — covers anaerobes, also inhibits toxin production) +
  • Penicillin G (covers streptococci)
• Alternatively: Meropenem/imipenem (carbapenem) for broad-spectrum coverage
• Modify based on culture and sensitivity
• Prolonged course (4–6 weeks)

3. Surgical Debridement (CORNERSTONE of treatment)

• Radical and aggressive wide local excision of all necrotic tissue — extending into healthy bleeding tissue
• Remove skin + subcutaneous fat; preserve fascia (not involved in Meleney's)
• Re-look and re-debridement at 24–48 hourly intervals until no further spread
• Repeated debridement often necessary
• Secondary intention or delayed primary closure after infection control

4. Wound Care

• Negative pressure wound therapy (NPWT/VAC dressing): Accelerates granulation, reduces bacterial load, removes exudate; applicable after initial debridement
• Regular wound dressings with antiseptics (povidone-iodine, Dakin's solution)
• Honey dressings (Manuka) — emerging evidence for chronic wounds

5. Hyperbaric Oxygen Therapy (HBO)

• 100% O2 at 2–3 atmospheres; 90-minute sessions, 2–3 times daily
• Creates hyperoxic tissue environment → lethal to anaerobes; enhances PMN killing capacity; promotes angiogenesis and wound healing
• Adjunct to surgery and antibiotics; limited by availability; not a substitute for debridement

6. Reconstructive Surgery

• Split-thickness skin grafting (SSG) once wound is clean with healthy granulation tissue
• Skin flaps for complex defects

7. Prognosis

• Overall mortality: 15–30% (lower than NF when promptly treated)
• Higher mortality in: Elderly, diabetics, immunocompromised, delayed diagnosis, perineal involvement
• Key determinant: Speed of diagnosis and aggressiveness of debridement

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Q.4b (10 Marks)

Spina Bifida

Definition

Embryology

• Primary neurulation (3rd–4th week gestation): Neural plate folds to form the neural tube; closure begins in the cervical region and extends bidirectionally
• Failure of caudal neuropore closure by day 26–28 → lumbar/sacral spina bifida
• Failure of rostral neuropore → anencephaly
• Most common at L4–L5 and L5–S1 levels (weakest point of posterior fusion)

Incidence

• 0.1–0.3 per 1000 live births (varies widely by geography and folic acid supplementation status)
• Women of childbearing age taking folic acid (400 mcg/day) reduces risk by 70%
• Higher incidence in Irish/Celtic populations; females slightly more affected

Aetiology

• Genetic factors: Recurrence risk 2–5% after first affected child; 10% after two
• Folic acid deficiency (most important modifiable risk factor): Folate is essential for DNA synthesis and neural tube closure
• Maternal diabetes mellitus
• Maternal hyperthermia in first trimester
• Anti-epileptic drugs (valproate — most teratogenic; carbamazepine)
• Obesity
• Environmental factors

Classification

1. Spina Bifida Occulta (Hidden)

• Most common and mildest form
• Failure of fusion of vertebral arches (most commonly L5 or S1) without herniation of neural elements
• Skin overlying the defect is intact (hence "occulta")
• Overlying skin markers: Dimple, tuft of hair (hypertrichosis), naevus, lipoma, haemangioma, dermal sinus
• Usually asymptomatic — discovered incidentally on X-ray
• May be associated with occult dysraphism: tethered cord, diastematomyelia, intraspinal lipoma, filum terminale lipoma → traction on cord → progressive neurological deterioration during growth

• Asymptomatic: Observation
• Symptomatic (neurological deficit, tethered cord): Surgical untethering

2. Spina Bifida Cystica (Manifest)

• Meninges herniate through the defect; sac contains CSF only (no neural tissue)
• Spinal cord is in normal position
• Skin coverage variable (may be partial or absent)
• Neurological deficits minimal or absent
• Less common than myelomeningocele

• Most common and severe form (90% of spina bifida cystica)
• Spinal cord and nerve roots are present within the herniated sac
• Sac contains neural placode (abnormal spinal cord tissue), meninges, and CSF
• Most commonly in lumbar and lumbosacral region
• Level of defect determines the severity of neurological deficit

• Motor deficits: Flaccid paraparesis/paraplegia; level depends on defect location (L3–L4: active hip flexion/extension, knee flexion; below L5: foot/ankle movement; L1–L2: total lower extremity weakness)
• Sensory deficits: Loss of pain, temperature, touch below the lesion; risk of pressure sores
• Sphincter dysfunction: Neurogenic bladder (most common cause of morbidity — recurrent UTIs, hydronephrosis, renal failure) and bowel (faecal incontinence, constipation)
• Sexual dysfunction

• Hip dislocation, hip flexion contractures
• Kyphoscoliosis (40–60%)
• Clubfoot (talipes equinovarus)

• Hydrocephalus (80–90% of myelomeningocele cases — from Chiari II malformation)
• Arnold-Chiari type II malformation: Hindbrain herniation (cerebellar tonsils + vermis + lower medulla descend through foramen magnum) → obstructive hydrocephalus; also brainstem dysfunction (stridor, apnoea, dysphagia)
• Tethered cord (post-repair)
• Intellectual disability (especially if shunt malfunctions)

• Neural plate open and exposed (no covering membrane)
• Severe; often incompatible with life

• Lipoma attached to the cord within the sac
• Skin-covered; less severe neurological deficit
• Requires surgery to prevent progressive tethering

3. Anencephaly

• Failure of anterior neuropore closure → absence of major brain structures
• Incompatible with life beyond the perinatal period

Investigations

• Maternal serum alpha-fetoprotein (MSAFP): Elevated in open NTDs (16–18 weeks); sensitivity ~80%
• Second-trimester ultrasound (anatomy scan, 18–20 weeks): Detects >95% of open NTDs; characteristic findings:
  • Lemon sign: Frontal bones appear scalloped (lemon shape) — from downward pull on the brain by tethered cord
  • Banana sign: Curved cerebellum (herniated through foramen magnum in Chiari II) — banana-shaped cerebellum on US
  • Myelomeningocele sac visible
  • Hydrocephalus (ventriculomegaly)
• Amniocentesis: AFP + acetylcholinesterase in amniotic fluid → confirms open NTD

• Clinical examination
• MRI spine and brain (lesion level, Chiari malformation, tethering, hydrocephalus)
• Cranial ultrasound (hydrocephalus monitoring post-shunt)
• Urodynamic studies (neurogenic bladder assessment)
• Renal ultrasound + DMSA scan (baseline renal function)

Management

Prevention

• Periconceptional folic acid: 400 mcg/day for all women of childbearing age; 5 mg/day if previous NTD child, anti-epileptic drugs, diabetes, or obesity
• Fortification of food (flour, cereals) with folic acid (public health measure)

Antenatal Management

• Multidisciplinary team: Obstetrics, foetal medicine, neonatal surgery, neurosurgery, urology, genetics
• Foetal surgery (MMC management — MOMS trial): Open foetal surgery for myelomeningocele repair at 19–26 weeks gestation reduces need for ventriculoperitoneal shunt (VP shunt) from 82% to 40%; improves motor function; risk of premature delivery; selective patients; now also available as fetoscopic repair
• Caesarean section delivery recommended (to avoid further trauma to the sac)

Neonatal Surgery (Immediate)

• Myelomeningocele closure within 24–72 hours of birth:
  • Prevents infection (meningitis/ventriculitis)
  • Reduces loss of neurological function from exposed cord
  • Sterile saline-moistened dressings until surgery
  • Technique: Dissection of neural placode from surrounding skin; construct dural closure; fascial closure; skin closure (Z-plasty, rotational flaps if large defect)
• VP shunt placement (for hydrocephalus, if present): Ventriculoperitoneal shunt drains CSF from lateral ventricle to peritoneal cavity; complications: shunt blockage, shunt infection

Long-term Management (Multidisciplinary)

Prognosis

• Spina bifida occulta: Normal life expectancy
• Meningocele: Near-normal with prompt surgery
• Myelomeningocele: Depends on level of lesion:
  • High lumbar (L1–L2): Wheelchair-bound; total incontinence
  • Low lumbar (L4–L5): May be ambulatory with orthoses
  • Sacral: Often ambulatory; urinary/bowel dysfunction
  • 80–90% survive to adulthood with modern multidisciplinary care
  • Major causes of death: Shunt failure, renal failure (from neurogenic bladder), respiratory complications (Chiari)
  • Intelligence: 70–80% have normal or borderline intelligence (if shunt managed well)

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• Q.1 (30 marks): Lymphovascular anatomy of stomach + Merits, demerits and method of D2 gastrectomy
• Q.2 (20 marks): Anatomy of triangles of neck + Cervical lymphadenopathy — differential diagnosis and management
• Q.3 (20 marks): Complications of enteric fistula + Management + Role of TPN
• Q.4 (30 marks): (1) Surgical anatomy of thoracoabdominal diaphragm (2) Wounds — types and medico-legal importance (3) Anatomy of ischiorectal fossa and surgical importance

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MS General Surgery Branch-I — June 2023, Paper-1

Complete Answers According to Weightage

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Q.1 (30 Marks)

Lymphovascular Anatomy of Stomach + Merits, Demerits and Method of D2 Gastrectomy

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PART A: LYMPHOVASCULAR ANATOMY OF THE STOMACH

ARTERIAL SUPPLY

1. Along the Lesser Curvature

• Largest branch to the stomach
• Arises directly from the coeliac axis
• Runs upward and to the left → reaches the oesophagogastric junction → descends along the lesser curvature in the lesser omentum
• Divides into anterior and posterior branches → anastomose with right gastric artery
• Also gives an oesophageal branch (ascending) to the lower oesophagus

• Usually arises from the hepatic artery proper (may arise from common hepatic or gastroduodenal artery)
• Small vessel; runs along the lesser curvature from right to left
• Anastomoses with the left gastric artery → forms the lesser curvature arcade

2. Along the Greater Curvature

• Branch of the gastroduodenal artery (which arises from the common hepatic artery)
• Runs from right to left along the greater curvature in the greater omentum
• Anastomoses with left gastroepiploic artery → forms greater curvature arcade
• Also gives epiploic branches to the greater omentum

• Branch of the splenic artery (most commonly at or near the splenic hilum)
• Runs from left to right along the greater curvature
• Anastomoses with right gastroepiploic

3. Fundus

• 4–6 short branches arising from the splenic artery (or its terminal branches at the splenic hilum)
• Pass through the gastrosplenic ligament to supply the fundus
• No major anastomotic arcades → fundus is least well-collateralised region

Key Surgical Points:

• The stomach has such extensive collateral circulation that it can survive on any ONE of the four main arteries
• After total gastrectomy with Roux-en-Y oesophagojejunostomy, the oesophagus is vulnerable — the inferior oesophageal artery (from left gastric) is ligated; hence careful preservation of distal oesophageal vascularity is essential

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VENOUS DRAINAGE

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LYMPHATIC DRAINAGE

Primary (First-tier) Lymph Nodes — N1 nodes (Stations 1–6)

Secondary (Second-tier) Lymph Nodes — N2 nodes (Stations 7–12)

Tertiary Lymph Nodes — N3 nodes (Stations 13–16)

Troisier's Sign / Virchow's Node:

Sentinel Lymph Node Concept:

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PART B: D2 GASTRECTOMY — METHOD, MERITS AND DEMERITS

Background and Definitions

• Total gastrectomy: Removal of the entire stomach
• Subtotal gastrectomy: Removal of 4/5 of the stomach (proximal gastric remnant preserved)
• Proximal gastrectomy: Removal of the proximal stomach (for fundus/cardia tumours)

• D0: Incomplete removal of N1 nodes
• D1: Complete removal of N1 (perigastric) nodes (Stations 1–6)
• D1+: D1 + Stations 7, 8a, 9 (left gastric, hepatic, coeliac)
• D2: Complete removal of N1 + N2 nodes (Stations 1–12)
• D2+: D2 + Stations 13, 14v (retropancreatic, SMA nodes)
• D3: Para-aortic node dissection (Station 16) in addition — not standard practice

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METHOD OF D2 GASTRECTOMY

Pre-operative Assessment:

• CT chest/abdomen/pelvis (staging; assess vascular anatomy; exclude metastases)
• Diagnostic laparoscopy (exclude peritoneal metastases; M0 confirmed)
• Upper GI endoscopy + biopsy (histological type; Borrmann classification; Lauren type)
• Endoscopic ultrasound (EUS) for local staging (T and N stage)
• PET-CT (metastatic disease)
• Nutritional assessment; correct malnutrition pre-operatively (nasojejunal feeding, immunonutrition)
• Multidisciplinary team (MDT) discussion
• Neo-adjuvant chemotherapy (FLOT protocol — 5-FU/leucovorin/oxaliplatin/docetaxel — for resectable T3/T4 or node-positive disease; FLOT4 trial)

Patient Position:

• Supine with legs apart; head-up tilt (reverse Trendelenburg); arms out
• Urinary catheter; OG tube

Approach:

• Open: Midline laparotomy from xiphisternum to umbilicus (extend below umbilicus if required)
• Laparoscopic: 5-port technique; increasingly standard in high-volume Eastern centres (JCOG0912, KLASS-02 trials); equivalent oncological outcomes to open for T1-T3 disease
• Robotic: da Vinci system; better visualisation and wristed instruments; superior ergonomics; not yet proven superior to laparoscopic

Step-by-Step Operative Technique (Open D2 Total Gastrectomy):

• Systematic laparotomy — liver, peritoneum, omentum, pelvic cul-de-sac (Pouch of Douglas — Blumer's shelf), ovaries (Krukenberg tumours), para-aortic nodes
• Confirm M0 status; proceed if curative intent possible
• Station 16 biopsy if para-aortic nodes enlarged (if positive = metastatic disease, resection may not be curative)

• Detach the greater omentum from the transverse colon (infracolic omentectomy)
• Divide the gastrocolic ligament at the level of the transverse mesocolon
• Dissect the omental bursa (lesser sac) — enables clearance of infrapyloric nodes (Station 6)
• For T3/T4 tumours involving the greater curvature: perform bursectomy (resection of the posterior peritoneal lining of the lesser sac)

• Ligate and divide the right gastroepiploic vessels at their origin from the gastroduodenal artery (GDA) and SMV
• Clearance of all infrapyloric (Station 6) nodes

• Mobilise the duodenum (Kocher's manoeuvre)
• Divide the duodenum 2 cm distal to the pylorus using a linear stapler (GIA)
• Allows access to the porta hepatis, hepatoduodenal ligament

• Dissect the hepatoduodenal ligament (lesser omentum) from its attachment to the liver
• Clear all nodal tissue from the hepatic artery proper, bile duct, and portal vein

• Trace the common hepatic artery to its origin from the coeliac axis
• Clear all nodal tissue along the common hepatic artery (Station 8a/8p)
• Continue to the coeliac axis — Station 9 nodes
• Ligate and divide the left gastric artery at its origin from the coeliac axis (for maximum proximal control and clearance of Station 7 nodes along the left gastric artery)
• Left gastric artery ligation at the coeliac axis is the key step distinguishing D2 from D1 dissection

• Dissect along the splenic artery from its origin to the splenic hilum
• Clear all perisplenic and hilar nodes (Station 10) and splenic artery nodes (Stations 11p, 11d)
• Splenectomy: Historically performed with D2 gastrectomy; now NOT routinely performed (JCOG0110 trial showed splenectomy adds morbidity without survival benefit unless direct splenic invasion by tumour)
• Spleen-preserving D2: Preferred in current practice; dissects perisplenic nodes without removing the spleen

• Divide the gastrohepatic ligament
• Retract the left lobe of the liver (using a Goligher or liver retractor)
• Open the phrenoesophageal membrane
• Mobilise the oesophagus; divide the oesophagus 5 cm above the OGJ (or with a tumour-free margin of at least 3 cm for oesophageal involvement, confirmed with frozen section)
• Clear paracardial nodes (Stations 1, 2)

• Specimen removed en bloc: stomach + greater omentum + lesser omentum + all nodal tissue
• Sent for frozen section of the proximal (oesophageal) and distal (duodenal) margins

• Roux-en-Y is standard reconstruction after total gastrectomy:
  1. Roux limb: Divide jejunum 20–25 cm from the ligament of Treitz
  2. End-to-side or end-to-end oesophagojejunostomy (jejunum anastomosed to the oesophageal stump)
     • Circular stapler (EEA, CEEA — circular end-to-end anastomotic stapler) most commonly used; or hand-sewn
     • Anastomosis checked: Air insufflation test; methylene blue test; frozen section
  3. Jejunojejunostomy: Distal limb to the Roux limb (60 cm distal to oesophagojejunostomy) — restores bowel continuity
• For subtotal gastrectomy: Billroth II (gastrojejunostomy) or Roux-en-Y gastrojejunostomy

• A fine-bore feeding jejunostomy (Witzel or Ryle's needle-catheter jejunostomy) is placed routinely
• Allows early enteral feeding (Day 1 post-operatively) — reduces infectious complications; reduces length of stay

• Two tube drains (near anastomosis)
• Mass closure of the abdomen (looped PDS No. 1)

ERAS (Enhanced Recovery After Surgery) Protocol for Gastrectomy:

• Prehabilitation (physiotherapy, nutritional optimisation)
• Multimodal analgesia (epidural/PCA, NSAIDs, paracetamol)
• Early mobilisation (Day 1)
• Early enteral nutrition (jejunostomy Day 1)
• Thromboprophylaxis (LMWH + TED stockings)
• No routine NG tube post-operatively (evidence against routine use)

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MERITS OF D2 GASTRECTOMY

1. Superior oncological staging: Minimum 16 lymph nodes examined allows accurate TNM staging; D1 dissection provides inadequate node count for staging (risk of stage migration)
2. Better locoregional control: Removal of N2 nodes eliminates micrometastatic disease in second-echelon nodes → reduces locoregional recurrence
3. Improved survival in node-positive disease: The Dutch D1D2 trial (15-year follow-up) demonstrated significantly improved gastric cancer-related mortality with D2 vs D1 in patients with node-positive disease and in those treated by experienced surgeons at high-volume centres. D2 is the standard of care in Asia with 5-year OS ~60% in resectable disease
4. Curative intent: D2 allows classification of truly R0 resection; nodes along the coeliac axis and hepatic artery are cleared
5. Therapeutic benefit even for "involved" N2 nodes: Some N2 nodes that appear positive on CT are actually inflammatory; removal provides cure
6. Standard of care in Asia and high-volume Western centres: Endorsed by JGCA Guidelines, ESMO Guidelines, and NCCN Guidelines for T2 or higher disease
7. Avoids reoperation for recurrent lymphadenopathy: D1 resections have higher rates of nodal recurrence requiring palliative chemotherapy
8. Lower recurrence with added chemotherapy: FLOT-based perioperative chemotherapy + D2 gastrectomy gives the best outcomes for resectable gastric cancer (FLOT4 trial)

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DEMERITS OF D2 GASTRECTOMY

1. Higher operative morbidity: Postoperative morbidity rate 25–46% vs 15–25% for D1 (Dutch trial). Common complications include: pancreatic fistula, anastomotic leak, delayed gastric emptying, intra-abdominal abscess, bile leak, wound infection
2. Higher operative mortality: Dutch D1D2 trial: operative mortality D2 = 10% vs D1 = 4% — largely attributable to the routine distal pancreatosplenectomy that was performed with D2 in that era (no longer recommended)
3. With current technique (spleen-sparing, pancreas-preserving D2): Morbidity and mortality are significantly lower and comparable to D1 in high-volume centres (Japanese randomised trials: JCOG0912)
4. Technically demanding: Requires extensive surgical training and experience; steep learning curve; results are surgeon- and centre-dependent
5. Longer operative time: 3–5 hours for D2 vs 2–3 hours for D1
6. Increased blood loss: Greater dissection near major vessels; risk of splenic vein/portal vein injury
7. Post-gastrectomy syndromes: After total gastrectomy with D2:
   • Dumping syndrome (early and late): Early (30 minutes post-meal) — rapid emptying of hyperosmolar food into jejunum → fluid shift → tachycardia, flushing, diarrhoea; Late (2–3 hours) — reactive hypoglycaemia from insulin overshoot
   • Nutritional deficiencies: Vitamin B12 (loss of intrinsic factor from parietal cells — monthly IM injection required lifelong), iron, fat-soluble vitamins (A, D, E, K), folate, calcium → megaloblastic/iron deficiency anaemia; osteoporosis
   • Weight loss: 10–15% of pre-operative weight; dietitian follow-up essential
   • Reflux oesophagitis: Alkaline bile reflux into the oesophagus (especially with Billroth II)
   • Roux stasis syndrome (after Roux-en-Y): Stasis in the Roux limb → nausea, vomiting, pain
8. Splenectomy (if performed): Historically required for full D2 hilar dissection → increased infectious complications (post-splenectomy overwhelming sepsis — OPSI), pancreatic fistula from tail injury, increased morbidity. Nowavoidable with spleen-preserving technique
9. Risk of pancreatic injury: Dissection along the splenic artery requires care; inadvertent injury to pancreatic tail → pancreatic leak, fistula, abscess
10. Not beneficial in T1 disease: D1 or D1+ is adequate and recommended for early gastric cancer (T1N0) — D2 is overtreatment with added morbidity for early disease

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Q.2 (20 Marks)

Anatomy of Triangles of Neck + Cervical Lymphadenopathy

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PART A: ANATOMY OF TRIANGLES OF THE NECK

SCM — The Dividing Muscle

• Origin: Sternal head (anterior sternum) + clavicular head (medial third of clavicle)
• Insertion: Mastoid process and lateral superior nuchal line
• Action: Unilateral — rotation and lateral flexion of head; bilateral — neck flexion
• Nerve supply: Accessory nerve (CN XI) + C2/C3 proprioception

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ANTERIOR TRIANGLE OF THE NECK

• Anteriorly: Midline of the neck
• Posteriorly: Anterior border of SCM
• Superiorly: Inferior border of mandible
• Apex: Suprasternal notch

1. Submental Triangle (Unpaired, in the midline)

2. Submandibular (Digastric) Triangle

3. Carotid Triangle

4. Muscular (Omotracheal) Triangle

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POSTERIOR TRIANGLE OF THE NECK

• Anteriorly: Posterior border of SCM
• Posteriorly: Anterior border of trapezius
• Base (inferiorly): Middle third of clavicle
• Apex: Convergence of SCM and trapezius at the superior nuchal line/mastoid process
• Roof: Deep cervical fascia
• Floor (from above down): Splenius capitis, levator scapulae, scalenus medius and posterior

5. Occipital Triangle (larger, superior portion)

6. Supraclavicular (Subclavian/Omoclavicular) Triangle (smaller, inferior)

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Deep Cervical Fascia Layers

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PART B: CERVICAL LYMPHADENOPATHY — DIFFERENTIAL DIAGNOSIS AND MANAGEMENT

Cervical Lymph Node Levels (Modified Robbins Classification)

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Differential Diagnosis of Cervical Lymphadenopathy

I. Reactive/Inflammatory (most common overall)

II. Infective — Bacterial

III. Granulomatous/Other

IV. Neoplastic

V. Non-lymph Node Neck Swellings (Differential in the Neck)

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Management of Cervical Lymphadenopathy

History (Key Points):

• Duration, size, rate of growth, pain, tenderness
• Associated symptoms: Fever, night sweats, weight loss (B symptoms), sore throat, ear pain, dysphagia, hoarseness
• Smoking, alcohol (HNSCC risk)
• Travel history (TB endemic areas, cat scratch exposure, HIV risk)
• Age: Children → reactive/EBV/atypical mycobacteria; Young adults → lymphoma/EBV; Older adults → metastatic carcinoma
• Oral hygiene, dental history

Examination:

• Size (>1 cm in adults is clinically significant; >1.5 cm in submandibular and Level II)
• Single vs multiple, bilateral vs unilateral
• Consistency: Hard (metastatic carcinoma), rubbery (lymphoma), tender/warm (infection), fluctuant (abscess/cold abscess)
• Fixed vs mobile (fixation = malignancy/TB)
• Skin: Colour (erythema = acute suppurative; violaceous = atypical mycobacteria)
• Complete head and neck examination: Oral cavity (teeth, floor of mouth, tongue, buccal mucosa), nasopharynx (nasal endoscopy/postnasal space mirror), larynx (indirect laryngoscopy/flexible laryngoscopy), ear canals, thyroid, salivary glands
• General: Hepatosplenomegaly, axillary/inguinal nodes (generalised lymphadenopathy → lymphoma/viral/systemic)
• Skin: Scalp, ear (primary SCC)

Investigations:

1. FBC + differential: Lymphocytosis (viral, EBV); neutrophilia (bacterial); eosinophilia (parasitic); pancytopaenia (lymphoma with BM infiltration); atypical lymphocytes (EBV, CMV)
2. ESR, CRP, LDH (elevated in lymphoma)
3. Monospot test / Paul-Bunnell: EBV
4. Serology: EBV IgM/IgG, CMV IgM, Toxoplasma IgM, Bartonella IgM (cat scratch), HIV serology
5. Mantoux/TST or IGRA (QuantiFERON-TB Gold): TB
6. CXR: TB, sarcoidosis, lymphoma, mediastinal involvement
7. Ultrasound neck: Defines architecture; lymphomatous nodes (round, loss of fatty hilum, peripheral vascularity on Doppler); metastatic nodes (heterogeneous, cystic change — especially from PTC or HPV-related HNSCC); guides FNA/core biopsy

• Nasopharyngoscopy + oropharyngoscopy + laryngoscopy + bronchoscopy + oesophagoscopy under GA
• Random biopsies from nasopharynx, base of tongue, pyriform sinuses, tonsillectomy
• p16 IHC staining on node biopsy (positive = HPV-related OPC as likely primary)
• EBV-encoded RNA (EBER) in situ hybridisation: NPC primary

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Specific Management

• Reassurance; watchful waiting 4–6 weeks
• Treat underlying infection if bacterial (antibiotics)
• EBV: Supportive; avoid contact sports (splenomegaly risk); no amoxicillin (maculopapular rash)

• Anti-TB therapy: 2HRZE/4HR (rifampicin, isoniazid, pyrazinamide, ethambutol × 2 months; then rifampicin + isoniazid × 4 months)
• Do NOT incise cold abscess (chronic sinus risk) — aspiration only if needed
• Surgical excision: If drug-resistant, enlarging node on therapy, or diagnostic uncertainty

• Antibiotics (IV amoxicillin-clavulanate/flucloxacillin)
• Incision and drainage if abscess forms
• Drain + pack; wound care

• PET-CT staging; bone marrow biopsy
• Stages I–II: ABVD chemotherapy (adriamycin, bleomycin, vinblastine, dacarbazine) × 4 cycles ± involved-field radiotherapy
• Stages III–IV: ABVD × 6 cycles; BEACOPP for advanced stage; auto-SCT for relapse

• Depends on histological grade and stage
• DLBCL (diffuse large B-cell — most common aggressive NHL): R-CHOP (rituximab + cyclophosphamide, hydroxydaunorubicin, vincristine, prednisolone) × 6 cycles
• Indolent NHL (follicular): Watch and wait or rituximab ± chemotherapy

• Treat the primary + neck
• Radical/modified radical neck dissection (MRND) or selective neck dissection (SND) depending on level of involvement and primary treatment
• Radiotherapy ± concurrent chemotherapy (cisplatin) for HNSCC with nodal disease
• Thyroid carcinoma: Total thyroidectomy + central compartment dissection (Level VI) ± lateral neck dissection (Levels II–V) if lateral nodes involved

• Excision biopsy for diagnosis
• PET-CT + panendoscopy with random biopsies
• If HPV-positive (p16+): OPC primary — treat as oropharyngeal primary (excellent outcomes with chemoradiotherapy)
• If no primary found: Bilateral neck irradiation (bilateral to include all mucosal sites) ± chemotherapy
• Bilateral tonsillectomy as therapeutic manoeuvre (bilateral synchronous or sequential) — primary may be found in the tonsil in 20–25% of p16+ cases

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Q.3 (20 Marks)

Complications of Enteric Fistula + Management + Role of TPN

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Definition

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Classification of ECF

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Causes of Enteric Fistula

• Crohn's disease (most common spontaneous cause)
• Malignancy (gastric, colorectal, ovarian carcinoma)
• Radiation enteropathy (delayed, 6–12 months post-radiotherapy)
• Diverticular disease
• Tuberculosis

• Anastomotic leak (most common cause — 75% of ECF are post-operative)
• Inadvertent enterotomy during adhesiolysis
• Ischaemic anastomosis (tension, impaired blood supply)
• Distal obstruction (causing increased intraluminal pressure at anastomosis)
• Technical failure (inadequate suture technique)

• Foreign body
• Radiation
• Infection/Inflammation
• Epithelialization of tract
• Neoplasm
• Distal obstruction
• Short fistula tract (<2 cm)

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COMPLICATIONS OF ENTERIC FISTULA

1. Fluid and Electrolyte Imbalance — Most Immediate Life-Threatening Complication

• High-output fistulae (especially proximal — duodenal/jejunal) lose large volumes of electrolyte-rich fluid
• Fluid losses and their electrolyte composition:

• Consequences:
  • Hypovolaemia → pre-renal acute kidney injury
  • Hyponatraemia, hypokalaemia, hypomagnesaemia
  • Metabolic acidosis (loss of bicarbonate in proximal fistulae) or metabolic alkalosis (loss of HCl from gastric fistula)
  • Dehydration

2. Sepsis and Infection

• Enteric contents contaminate the peritoneal cavity or wound → peritonitis, intra-abdominal abscess
• Undrained intra-abdominal collections → persistent sepsis → multiorgan failure (MOF)
• Wound infection; wound dehiscence
• Most common cause of death in ECF is sepsis and its sequelae
• Bacteraemia from gram-negative organisms (E. coli, Klebsiella, Bacteroides) → septic shock

3. Malnutrition

• Loss of nutrients through the fistula
• Inability to absorb adequate nutrition (short-circuiting of intestine)
• Increased metabolic demands of sepsis/inflammation
• Consequences:
  • Hypoalbuminaemia (<30 g/L → impairs wound healing, immune function, increases oedema)
  • Negative nitrogen balance → muscle wasting, sarcopaenia
  • Immune suppression (increased infection risk)
  • Impaired wound healing → fistula fails to close
  • Zinc, selenium, and micronutrient deficiencies
• Malnutrition is a vicious cycle: It promotes sepsis → sepsis worsens malnutrition

4. Skin Excoriation and Wound Complications

• High-output proximal fistulae discharge activated pancreatic enzymes and bile → enzymatic digestion of the perifistular skin
• Severe excoriation, macerations, erosions, and ulcerations of the surrounding skin
• Pain, infection of skin wounds
• Colostomy bags and enterostomal therapy (stoma care) essential to manage output and protect skin

5. Electrolyte and Acid-Base Disturbances

• Gastric fistula: Hypochloraemia + hypokalaemia + metabolic alkalosis
• Proximal small bowel fistula: Metabolic acidosis + sodium/potassium loss
• Colonic fistula: Less severe disturbances

6. Anaemia

• Chronic blood loss through the fistula
• Poor nutrition → iron, folate, B12 deficiency
• Anaemia of chronic inflammation/sepsis (haepcidin-mediated)
• Impairs wound healing and immunity

7. Failed Wound Healing / Non-closure of Fistula

• Presence of any FRIENDS factor perpetuates the fistula
• Uncontrolled sepsis prevents spontaneous closure

8. Psychological and Social Consequences

• Prolonged hospitalisation
• Chronic wound management
• Body image disturbance (malodorous wound)
• Depression, anxiety

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MANAGEMENT OF ENTERIC FISTULA

• Sepsis control
• Nutritional support
• Anatomy definition
• Procedure (definitive surgery)

Phase 1: Resuscitation (Days 1–5)

1. Fluid resuscitation: IV crystalloids (Hartmann's/0.9% NaCl); replace fistula losses volume-for-volume
2. Electrolyte correction: Daily U&E monitoring; correct Na⁺, K⁺, Mg²⁺, phosphate, Ca²⁺
3. Blood transfusion if haematocrit <7 g/dL
4. Skin protection: Stoma bags, skin barrier creams (Stomahesive, Cavilon), barrier films; stoma therapy nurse; VAC-assisted wound management

Phase 2: Sepsis Control (Days 1–14)

1. CT scan of abdomen: Identify and drain undrained collections (interventional radiology — percutaneous drain placement)
2. Broad-spectrum antibiotics: Piperacillin-tazobactam ± metronidazole; target-directed after cultures
3. Source control: Drain all abscesses; debride infected/necrotic tissue
4. NPO (nil per os): To reduce fistula output
5. Octreotide: Somatostatin analogue; reduces GI secretions by 50% → reduces fistula output and may aid closure; 100–200 mcg SC three times daily or continuous infusion; most effective for high-output fistulae
6. Proton pump inhibitor (PPI): Omeprazole/pantoprazole IV; reduces gastric secretions; useful for gastric/duodenal fistulae

Phase 3: Nutritional Support (Weeks 1–6)

1. Commence parenteral or enteral nutrition once resuscitated and initial sepsis controlled
2. Target: Positive nitrogen balance; achieve albumin >30 g/L; weight stabilisation
3. Wound care: Continued; allow granulation; preparation for closure

Phase 4: Anatomy Definition (Weeks 4–8)

1. Fistulogram: Injection of water-soluble contrast via the fistula track → defines the track, origin, distal obstruction
2. CT fistulogram: Best overall assessment; identifies collections, residual infection, foreign bodies, track complexity
3. Small bowel follow-through / CT enteroclysis: Defines the entire small bowel; identifies Crohn's disease, radiation stricture, distal obstruction
4. MRI: For complex pelvic fistulae (enterovaginal, enterovesical)
5. Endoscopy: May identify intraluminal pathology (anastomotic stenosis, Crohn's, tumour)

Phase 5: Decision

• Spontaneous closure occurs in 30–70% of ECF if no FRIENDS factors are present
• Expected by 4–6 weeks from establishment of nutrition and sepsis control
• If no closure by 6 weeks with optimal management → surgery

• Low-output fistula
• Intact bowel continuity
• No distal obstruction
• No epithelialization of tract
• No foreign body or malignancy
• Short fistula track
• Favourable nutrition (albumin >30 g/L)

Phase 6: Definitive Surgery (If No Spontaneous Closure)

• Timing: Wait minimum 6 weeks from initial surgery for adhesions to soften; ideally 3–6 months; albumin >30 g/L; no active sepsis
• Procedures:
  • Resection of fistula-bearing segment + primary anastomosis (if general condition permits)
  • Defunction with stoma (protect anastomosis) + later reversal
  • Stricturoplasty (for Crohn's disease)
  • Mesh explantation if a mesh foreign body is the cause

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ROLE OF TOTAL PARENTERAL NUTRITION (TPN) IN ENTERIC FISTULA

Definition

Indications for TPN in ECF

1. High-output proximal fistula (>500 mL/day) — enteral feeding increases fistula output; bowel rest required
2. Inability to feed enterally due to: distal obstruction, multiple entero-enteric fistulae, short bowel
3. Active peritonitis or ongoing sepsis (relative contraindication to enteral feeding)
4. Inadequate access distal to fistula for enteral feeding
5. Malnutrition with albumin <25 g/L requiring rapid correction
6. Peri-operative nutritional support (where enteral route is unavailable)

Principles of TPN in ECF

• Calories: 25–35 kcal/kg/day (hypermetabolism in sepsis → higher)
• Protein: 1.5–2.5 g/kg/day (high protein requirement for wound healing and to counteract catabolism)
• Carbohydrates: 60–70% of non-protein calories (dextrose)
• Fat: 30–40% of non-protein calories (lipid emulsions — medium/long chain triglycerides)
• Fluids and electrolytes: Replace fistula losses daily
• Micronutrients: Zinc (particularly important for wound healing — 220 mg/day), selenium, copper, B vitamins, vitamins A, C, E (antioxidants), vitamin K

Venous Access for TPN

• Central venous catheter (CVC): PICC line (peripherally inserted central catheter) or internal jugular/subclavian/femoral tunnelled central line
• TPN cannot be given peripherally (high osmolality → phlebitis and thrombophlebitis)

Role of TPN in ECF (Specific Benefits)

1. Bowel rest: Reduces GI secretions and fistula output → allows spontaneous closure
2. Overcomes inability to use GI tract: Provides nutrition when gut cannot be used
3. Reverses malnutrition: Improves albumin, nitrogen balance, immune function → optimal environment for spontaneous closure
4. Pre-operative optimisation: Corrects malnutrition before definitive surgery → reduces peri-operative complications (anastomotic leak, poor wound healing, immune suppression)
5. Reduces mortality: Malnutrition is a major cause of death in ECF; TPN directly reduces mortality from nutritional causes

Complications of TPN

TPN vs Enteral Nutrition (EN) in ECF

• Nasojejunal tube placed distal to fistula (fluoroscopy/endoscopy)
• Feeding jejunostomy (placed surgically distal to the fistula)
• These allow enteral nutrition while bypassing the fistula

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Q.4 (30 Marks) — Write in Brief on:

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Q.4(1): Surgical Anatomy of the Thoracoabdominal Diaphragm and Surgical Importance

Introduction

Shape and Description

• Dome-shaped musculotendinous structure
• Two domes: Right dome (higher — supported by liver; reaches as high as 5th intercostal space at full expiration) and left dome (lower — overlies stomach and spleen; 6th rib level)
• At full inspiration: Both domes descend to approximately the 6th rib level (right) and 7th rib level (left)
• Centrally: The central tendon (trefoil-shaped — three leaflets: right, left, middle) is the aponeurotic centre
• Peripherally: Muscular fibres arise from the peripheral attachments

Attachments (Origins)

• Two slips from the posterior surface of the xiphoid process
• Small; often absent

• Inner surfaces of the lower 6 costal cartilages (7–12) and their associated ribs
• Interdigitates with transversus abdominis origin

• The crura are connected anteriorly by the median arcuate ligament (arches over the aorta)
• Medial arcuate ligament: Thickening of the psoas fascia (from T12/L1 body to the transverse process of L1); psoas muscle passes beneath
• Lateral arcuate ligament: Thickening of quadratus lumborum fascia (from L1 transverse process to the tip of 12th rib); quadratus lumborum passes beneath

• All fibres converge centrally → central tendon (no bony insertion)
• The pericardium is fused with the middle leaf of the central tendon

Major Openings of the Diaphragm

• Left phrenic nerve: Passes through the diaphragm near the central tendon separately (unlike right phrenic which passes through the caval foramen)
• Splanchnic nerves (greater, lesser, least): Through the crura
• Sympathetic trunks: Under the medial arcuate ligament
• Superior epigastric vessels: Between the sternal and costal parts (foramen of Morgagni)
• Musculophrenic vessels: Through the costal portion

Blood Supply

• Arterial: Superior phrenic arteries (from thoracic aorta); inferior phrenic arteries (first branches of abdominal aorta — or coeliac axis); musculophrenic and pericardiacophrenic arteries (from internal thoracic artery)
• Venous: Inferior phrenic veins → IVC; superior phrenic veins → azygos/hemiazygos

Nerve Supply

Weak Areas (Potential Sites of Herniation)

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Surgical Importance

1. Diaphragmatic Herniae

• OGJ and proximal stomach herniate above the diaphragm through the oesophageal hiatus
• Associated with GORD (gastro-oesophageal reflux disease)
• Treatment: Laparoscopic Nissen fundoplication (360°) or partial fundoplication; reduces hernia + repairs hiatus; plication of crura

• Fundus herniates through the hiatus alongside the oesophagus; OGJ remains below the diaphragm
• Risk of strangulation, organoaxial volvulus → emergency laparotomy
• Elective repair recommended when asymptomatic

• Left-sided posterolateral defect; gut in the chest → lung hypoplasia
• Presents at birth with respiratory distress, scaphoid abdomen, bowel sounds in chest
• Emergency management: NG tube, intubation, transfer to NICU; surgical repair after physiological stabilisation; ECMO if severe pulmonary hypertension
• High mortality (20–35%) from associated pulmonary hypoplasia and persistent pulmonary hypertension

• Blunt trauma → left hemidiaphragm rupture (most common)
• Penetrating wounds (stab, gunshot) → either side
• Bowel sounds in chest; NG tube coiling in chest on CXR
• Repair: Laparotomy (acute — allows reduction and repair); thoracotomy or laparoscopy (chronic)

2. Surgical Approaches Through/Past the Diaphragm

• Thoracoabdominal incision (8th/9th intercostal space + upper midline laparotomy): For distal oesophagus, cardia, total gastrectomy, hepatic resection, thoracoabdominal aortic aneurysm repair
• The diaphragm is divided in the direction of its fibres (circumferentially or radially to avoid phrenic nerve injury)
• Closure: Interrupted No. 1 PDS/nylon; ensure airtight; drain the pleural space

3. Phrenic Nerve

• Must be identified and preserved during: Oesophagectomy, pericardectomy, thoracoabdominal approaches, aortic surgery, mediastinal surgery, anterior cervical spine approaches
• Phrenic nerve palsy (from surgery or tumour invasion): Ipsilateral hemidiaphragm elevation on CXR; reduces respiratory reserve by ~25%; bilateral palsy → respiratory failure

4. Hiatus Anatomy in Oesophageal Surgery

• The oesophageal hiatus is enlarged during Ivor-Lewis oesophagectomy and total gastrectomy
• Must be repaired around the gastric conduit/jejunal loop to prevent herniation of abdominal contents into the chest
• Phrenoesophageal ligament dissection during hiatal repair must be meticulous to avoid pneumothorax

5. Phrenic Nerve Stimulation (Diaphragm Pacing)

• In high cervical spinal cord injury (C3–C5 above the phrenic motor nuclei) — implantable electrodes stimulate the phrenic nerve → diaphragmatic contraction → breathing without ventilator

6. Role in Lymphatic Spread

• Right lymphatics drain to right crus → cisterna chyli → thoracic duct (or directly)
• Subdiaphragmatic tumours (ovarian, gastric, colonic) can spread via diaphragmatic lymphatics to the right pleural cavity and the peritoneum
• Diaphragmatic metastases (peritoneal carcinomatosis) are resected as part of cytoreductive surgery

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Q.4(2): Wounds — Types and Medico-Legal Importance

Definition

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Classification of Wounds

A. By Aetiology

• Burns: Scalds (moist heat), flame burns, contact burns, chemical burns, radiation
• Patterned contact burns indicate the object (iron, cigarette)

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B. By Degree of Contamination (Surgical Classification)

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C. By Healing Mechanism

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Medico-Legal Importance of Wounds

1. Evidence of Crime

• Wounds constitute physical evidence that a crime has been committed
• The type of wound indicates the nature of the weapon or mechanism
• Number of wounds can indicate the degree of violence or intention
• Wound characteristics can place the victim and perpetrator in specific positions

2. Determining Cause of Death

• External examination and autopsy assessment of wounds establishes the manner and cause of death (homicide, suicide, accident, natural)
• Pattern injuries directly imply the mechanism and can identify the object

3. Wound Age Estimation

• Vital reaction (redness, swelling, pus): Indicates wound was inflicted before death
• Absence of vital reaction: Wound may be post-mortem
• Bruise colour progression: Rough guide to age (though unreliable as the sole indicator)
• Histopathology of the wound (neutrophil infiltration, granulation tissue, fibroblast proliferation) gives a more accurate age estimate

4. Identification of Weapon

• Patterned wounds, entry and exit characteristics, trajectory, trace evidence (carbon, soot) help identify the specific weapon
• Ballistic evidence from gunshot wounds (bullet track, stippling, soot)

5. Distinguishing Homicide from Suicide and Accident

6. Documentation and Reporting Obligations

• In all cases of injury by violence, assault, RTAs, burns, or unusual circumstances, the treating doctor has both a legal and ethical obligation to document wounds meticulously
• Documentation must include: Location (anatomical reference), dimensions (length × width × depth), shape, edges (clean/ragged), surrounding features (bruising, tattooing, soot), and any foreign material
• Mandatory reporting (varies by jurisdiction): Gunshot wounds, knife wounds, child abuse injuries, RTA injuries, burns in suspicious circumstances
• Chain of evidence: Medical documents, photographs, and swabs taken must be preserved with proper chain of custody documentation

7. Consent and Duty of Candour

• Proper documentation protects both the patient and the clinician
• Records must be contemporaneous, accurate, and legible

8. Wound Assessment in Children — Non-Accidental Injury (NAI)

• Bruises in unusual locations (earlobes, neck, genitalia, trunk, buttocks)
• Burns with clear lines ("glove and stocking" scalds — immersion in hot water as punishment)
• Multiple injuries of different ages
• Inconsistent history with the injury pattern
• Delay in presentation
• Mandatory reporting to safeguarding services

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Q.4(3): Anatomy of Ischiorectal Fossa and Surgical Importance

Alternative Name

Description and Location

• Paired pyramidal/wedge-shaped fat-filled spaces lying on either side of the anal canal
• Lie below the levator ani and above the perineal skin
• The two fossae communicate with each other posteriorly via the deep postanal space (behind the anococcygeal body) — allows spread of infection from one side to the other → horseshoe abscess

Boundaries

Roof

• Levator ani — the levator ani forms the roof of the ischiorectal fossa (descends medially); above this is the pelvic diaphragm separating the pelvic cavity from the fossa

Contents of the Ischiorectal Fossa

1. Fat: Large amount of fatty areolar tissue; allows distension of the anal canal during defaecation; poor vascular supply → susceptible to ischaemia and infection
2. Pudendal canal (Alcock's canal):
   • A fascial tunnel on the lateral wall of the fossa (within the obturator fascia)
   • Contains: Internal pudendal artery and vein; pudendal nerve (CN S2, S3, S4)
   • The pudendal nerve exits the pelvis via the greater sciatic foramen, curves around the ischial spine/sacrospinous ligament, and enters the pudendal canal through the lesser sciatic foramen
3. Inferior rectal (haemorrhoidal) nerve and vessels:
   • Branch from the pudendal nerve/vessels in the pudendal canal
   • Cross the ischiorectal fossa medially to supply the external anal sphincter and perianal skin
   • Sensory to the anal canal below the dentate line (somatic sensation — sharp, well-localised pain)
4. Perineal branch of S4 nerve: Supplies the levator ani
5. Scrotal/labial nerves (posterior branches): Supply scrotum/labia
6. Lymphatics: Drain to superficial inguinal lymph nodes

Dimensions (Approximate)

• Anteroposterior: ~5 cm
• Lateral (base): ~3 cm
• Depth: ~5 cm
• Contains ~30–40 mL of fat in the average adult

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Surgical Importance

1. Anorectal Abscess

• Severe throbbing perianal pain
• Fever, malaise
• Fluctuant tender perianal swelling (superficial) or deep perianal tenderness without obvious external swelling (deep/supralevator)
• Ischiorectal abscess: Large, deep; less obvious externally; diagnosed by deep palpation

• Emergency incision and drainage (I&D) under GA:
  • Ischiorectal abscess: Cruciate incision over the abscess (lateral to the anal margin to avoid sphincter); debride the cavity; break down loculations; pack
  • If internal opening identified (fistula): May attempt primary fistulotomy (low fistula only) or seton placement
  • Primary I&D without fistula surgery is safer in most cases
• Antibiotics: NOT curative alone; adjunct for cellulitis, immunocompromised, spreading sepsis, endocarditis risk

• Spread through the deep postanal space → bilateral horseshoe abscess → Fournier's gangrene
• Septicaemia
• Fistula formation (50% of anorectal abscesses result in fistula-in-ano)
• Sphincter damage (from pressure necrosis)

2. Fistula-in-Ano

• Parks' classification: Intersphincteric (most common, 70%), transsphincteric (25%), suprasphincteric (5%), extrasphincteric (rare)
• The ischiorectal fossa is traversed by transsphincteric fistulae
• Treatment: Fistulotomy (for low fistulae); seton (staged treatment for complex fistulae traversing significant external sphincter); LIFT (ligation of intersphincteric fistula tract); fibrin glue; advancement flap; video-assisted anal fistula treatment (VAAFT)

3. Pudendal Nerve Block (Anaesthesia)

• The pudendal nerve is blocked within Alcock's canal for:
  • Anorectal surgery (haemorrhoidectomy, fistulotomy) under local anaesthesia
  • Perianal procedures in obstetrics (episiotomy, instrumental delivery)
  • Chronic pelvic pain/pudendal neuralgia
• Technique: Transvaginal or transperineal injection of local anaesthetic near the ischial spine (landmark for pudendal nerve entry into Alcock's canal)

4. Ischiorectal Abscess Drainage — Avoiding Injury to Pudendal Structures

• The internal pudendal vessels and nerve run in Alcock's canal on the lateral wall
• All drainage procedures must be directed medially → lateral incisions risk injury to these structures
• Bleeding from the internal pudendal artery → severe haemorrhage → ligation or IR embolisation

5. Prostatectomy / Rectal Resection

• The ischiorectal fat provides the surgical plane for:
  • Abdominoperineal resection (APR): The perineal phase involves dissection through the ischiorectal fossa to mobilise the rectum and sphincters; the levator ani is divided, and the ischiorectal fat is resected as part of the specimen (cylindrical/extralevator APR = wider resection through the fossa to achieve wider margins for low rectal cancer)
  • Extralevator APR (ELAPE): Removes the entire levator ani en bloc; reduces circumferential resection margin (CRM) positivity rates and waist deformity ("coning") of conventional APR
• Perineal wound in APR: Ischiorectal fossa wound is complex; dehiscence rate 20–30%; primary closure vs. flap reconstruction (vertical rectus abdominis myocutaneous — VRAM flap) for complex/irradiated perineal wounds

6. Haemorrhoidectomy (Parks Position)

• Lithotomy or prone jackknife position
• The ischiorectal fossa defines the lateral extent of the dissection during haemorrhoidectomy
• Must not dissect lateral to the external sphincter into the ischiorectal fat → risk of ischiorectal abscess post-operatively

7. Fournier's Gangrene

• Necrotising fasciitis of the perineum involving the ischiorectal fossa
• Polymicrobial (synergistic) infection; rapidly spreading; high mortality (20–40%)
• Origin: Perianal infection, urethral instrumentation, scrotal/vulvar infection
• Spreads along fascial planes: Colles' fascia (superficial perineal) → Scarpa's fascia (anterior abdominal wall); but Colles' fascia prevents spread posteriorly beyond the transverse perineal muscles (until it involves the ischiorectal fat)
• Management: Emergency radical debridement (remove all necrotic tissue including ischiorectal fat), leaving the sphincters intact if possible; defunctioning colostomy; broad-spectrum antibiotics; NPWT; HBO; reconstructive surgery after control

8. Transsphincteric Approaches to the Rectum (York Mason Procedure)

• Posterior transsphincteric approach to the rectum (for rectal tumours, fistula repair) — divides the sphincters posteriorly, proceeds through the ischiorectal fat → posterior wall of rectum

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