• TPN (HHHH)
• Blood transfusion complications (HHHH)
• Assessment of burns area (HHH)
• Hand infections (HHH)
• Robotic Surgery (HHHH)
• Energy sources in surgery (HHH)
• Neuroendocrine tumour / Argentaffinoma (HHH)
• GIST (HHH)
• FAP (HHH)
• TAR - Transverse Abdominis Release (HHH)
• ERAS (HHH)
• Mesenteric Vascular Ischaemia (HHH)
• DVT (HHH)
• Adrenal tumour / Adrenalectomy (HHH)
• Breast Reconstruction (HHH)
• Extradural Haematoma (HHH)
• Tender scrotum swelling (HHH)
• Anorectal Malformations (HHH)
• Liver Hydatid Cyst (HHH)
• Undescended/Ectopic testis (HHH)

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📚 MS SURGERY — PART B HIGH-YIELD ANSWERS (10 Marks Each)

HHHH = Must Know | HHH = High Yield

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🔵 BASIC PRINCIPLES

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1. 🔴 TOTAL PARENTERAL NUTRITION (TPN) — HHHH

Indications — Mnemonic: "GI FASTS"

G — GI fistula (high output)
I  — Intestinal failure / short bowel syndrome
F  — Failure to thrive (severe malnutrition pre-op)
A  — Acute pancreatitis (severe)
S  — Short bowel syndrome
T  — TPN in IBD (Crohn's) to rest bowel
S  — Surgical patient unable to eat >7 days

Composition of TPN

• Males: 66 + (13.7 × Wt kg) + (5 × Ht cm) − (6.8 × Age)
• Females: 655 + (9.6 × Wt) + (1.8 × Ht) − (4.7 × Age)

Access

• Central venous catheter (subclavian or internal jugular) — TPN is hyperosmolar (>800 mOsm/L), requires large vein
• PICC line acceptable for ≤2 weeks

Complications — Mnemonic: "MICA"

M — Metabolic (hyperglycaemia, electrolyte imbalance, refeeding syndrome)
I  — Infective (central line-associated bloodstream infection - CLABSI)
C  — Catheter complications (pneumothorax, haemothorax, air embolism, thrombosis)
A  — Alimentary / GI (gut atrophy, cholestasis, hepatic steatosis)

• Phosphate, Mg, K shift intracellularly → hypophosphataemia → cardiac arrest
• Risk: malnourished patients fed too rapidly
• Prevention: start slow, supplement electrolytes

Monitoring TPN

Daily: Blood glucose, electrolytes, fluid balance
Weekly: LFTs, renal function, trace elements, lipid profile
TPN bag: Changed every 24 hours with aseptic technique

Flowchart: TPN Decision

Patient unable to tolerate enteral feed?
           ↓ YES
GI tract functional?
    ↓ NO              ↓ YES
    TPN           Enteral Nutrition
(Central line)    (NG/NJ/PEG tube)
    ↓
Calculate requirements
(Harris-Benedict × stress factor)
    ↓
Insert central line (subclavian/PICC)
    ↓
Start TPN slowly → titrate to goal
    ↓
Monitor daily glucose, electrolytes
    ↓
Wean TPN when GI function returns

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2. 🔴 BLOOD TRANSFUSION — Complications, Products & Substitutes — HHHH

Blood Products — Mnemonic: "WFPC"

W — Whole blood (rarely used now)
F  — Fresh Frozen Plasma (FFP) — all clotting factors
P  — Platelets (pooled / single donor apheresis)
C  — Cryoprecipitate (Factor VIII, fibrinogen, vWF, XIII)
+ Packed Red Blood Cells (PRBC) — most common

Complications — Mnemonic: "INCH TAILS"

I  — Immunological (haemolytic, non-haemolytic febrile reactions)
N  — Non-haemolytic febrile reaction (most common)
C  — Citrate toxicity / hypocalcaemia (massive transfusion)
H  — Haemolytic reaction (ABO incompatibility — MOST DANGEROUS)

T  — TRALI (Transfusion Related Acute Lung Injury) — #1 cause of death
A  — Allergic / Anaphylaxis (urticaria → anaphylaxis)
I  — Infection (HIV, HBV, HCV, CMV, Malaria, syphilis)
L  — Late haemolytic reaction (Rh/Kidd antigens, days-weeks later)
S  — TACO (Transfusion Associated Circulatory Overload)

Acute vs Delayed Reactions

Massive Transfusion Protocol (MTP)

• Definition: >10 units PRBC in 24 hrs
• 1:1:1 ratio — PRBC : FFP : Platelets
• Monitor: Temp, ionised Ca²⁺, ABG, coagulation
• Complications: Hypothermia, hypocalcaemia, hyperkalaemia, dilutional coagulopathy

Blood Substitutes

• Perfluorocarbons (PFCs): Dissolve O₂; no ABO typing needed
• HBOCs (Haemoglobin-Based O₂ Carriers): Modified haemoglobin
• Recombinant Factor VIIa: Haemostasis in massive bleeding

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3. 🟡 ASSESSMENT OF BURNS AREA — HHH

Methods of Assessment

         Head & Neck = 9%
        ┌──────────────┐
Arm 9%  │  Anterior    │  Arm 9%
(each)  │  trunk = 18% │  (each)
        │  Posterior   │
        │  trunk = 18% │
        └──────────────┘
    Thigh 9% (each)
    Leg 9% (each)
    Perineum = 1%
    Total = 100%

• Accounts for age-related changes in body proportions
• Head larger (18% in infant), legs smaller in children
• Most accurate method

• Patient's palm = 1% TBSA
• Useful for scattered/irregular burns

Burn Depth Classification

Mnemonic for Burn Severity — "BAPS"

B — Body surface area (>10% child, >15% adult = major)
A — Age (extremes of age = worse prognosis)
P — Part involved (face, hands, feet, genitalia, joints)
S — Special (chemical, electrical, inhalation)

Flowchart: Initial Burns Management

Airway (inhalation injury? → early intubation)
        ↓
Breathing (100% O₂ via mask)
        ↓
Circulation (2 large-bore IV, fluid resuscitation)
        ↓
Assess TBSA (Rule of Nines / Lund & Browder)
        ↓
Parkland Formula: 4 × Wt(kg) × %TBSA = Hartmann's in 24 hrs
(½ in first 8 hrs from time of burn; ½ in next 16 hrs)
        ↓
Analgesia + wound care + tetanus prophylaxis
        ↓
Burns unit referral (>15% adult, >10% child)

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4. 🟡 HAND INFECTIONS — HHH

Classification — Mnemonic: "PETS WF"

P — Paronychia (nail fold infection) — most common
E — Eponychia (posterior nail fold)
T — Tendon sheath infection (Flexor tenosynovitis)
S — Space infections (Palmar spaces, Web spaces)

W — Web space (collar-stud abscess)
F — Felon (pulp space infection)

Kanavel's 4 Signs of Flexor Tenosynovitis

1. Fusiform swelling of digit
2. Flexed posture of finger at rest
3. Pain on passive extension
4. Tenderness along tendon sheath

Palmar Spaces (High-Yield Anatomy)

   Thenar space         Mid-palmar space
   (radial to          (ulnar to 3rd
   3rd metacarpal)      metacarpal)
        ↓                    ↓
  Limited by              Limited by
  thenar muscles          fascia layers

• Separated by the oblique septum from middle finger flexor tendon
• Communication with forearm via Parona's space

Principles of Management

Mnemonic for Management — "DEAD"

D — Drainage (incision & drainage)
E — Elevation (reduce oedema)
A — Antibiotics (guided by culture)
D — Dressing + physio (prevent stiffness)

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🟢 MINIMAL ACCESS SURGERY

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5. 🔴 ROBOTIC SURGERY — HHHH

Components of Da Vinci System

┌─────────────────┐    ┌──────────────┐
│  Surgeon         │    │  Patient-side │
│  Console         │────│  Cart (Robot)│
│  (remote)        │    │  4 arms      │
└─────────────────┘    └──────────────┘
         ↕
    Vision Cart
  (3D endoscope system)

Advantages over Laparoscopy — Mnemonic: "WRIST 3D"

W — Wristed instruments (7° freedom of movement vs 4° laparoscopic)
R — Reduction of tremor (motion scaling 5:1)
I  — Intuitive control (same-direction hand-to-instrument)
S  — Stable platform (no fulcrum effect)
T  — Tactile feedback absent (limitation) BUT optic magnification
3D — Three-dimensional high-definition vision

Disadvantages

• No haptic (tactile) feedback
• High cost (initial + per case)
• Larger port sizes
• Prolonged set-up time
• Limited emergency access (undocking needed)

Current Applications in Surgery

Recent Advances

• Single-port robotic surgery (SP system)
• Fluorescence imaging (ICG for bile duct identification)
• Robotic NOTES
• Telesurgery / Remote surgery (future)
• Versius, Hugo RAS — competitors to Da Vinci

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6. 🟡 ENERGY SOURCES IN SURGERY — HHH

Classification — Mnemonic: "ELMU"

E — Electrosurgery (monopolar, bipolar)
L  — Laser (Nd:YAG, CO₂, KTP, argon)
M — Mechanical (ultrasonic — HARMONIC, CUSA)
U — Ultrasound (HIFU, focused US)

Electrosurgery

• Monopolar: Current → patient → active electrode → patient body → dispersive pad
  • Cutting mode: continuous sine wave → vaporisation
  • Coagulation mode: interrupted → desiccation/fulguration
• Bipolar: Current between 2 jaws of forceps only — safer near vital structures

• Capacitive coupling (current to trocar, inadvertent bowel burn)
• Direct coupling (insulation failure)
• Alternative site burns (displaced pad)
• Interference with pacemaker

Ultrasonic Energy (Harmonic Scalpel)

• Vibrates at 55,000 Hz
• Cuts + coagulates simultaneously
• Temperature: 80–100°C (vs electrosurgery 150–400°C)
• Advantage: Less lateral thermal spread, no smoke, safe near nerves
• Uses: Thyroidectomy, splenectomy, colonic surgery

Laser in Surgery

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7. 🟡 ERAS — Enhanced Recovery After Surgery — HHH

ERAS Protocol — Mnemonic: "PRE-OP, INTRA, POST"

• Patient education & counselling
• Carbohydrate loading (6 hrs for solids, 2 hrs for clear fluids)
• No prolonged fasting (abandon NPO after midnight)
• Mechanical bowel prep NOT routine
• Prophylactic antibiotics & anticoagulation
• Optimize nutrition (correct malnutrition)
• Prehabilitation (exercise, smoking cessation)

• Minimally invasive surgery (laparoscopic preferred)
• Short-acting anaesthetic agents
• Goal-directed fluid therapy (avoid over/under hydration)
• Avoid nasogastric tubes
• Epidural analgesia / TAP block
• Maintain normothermia (Bair Hugger, warm fluids)
• Short incisions, less tissue trauma

• Early oral feeding (within 4 hrs)
• Early mobilisation (Day 0/1)
• Multimodal analgesia (NSAIDs + paracetamol, avoid opioids)
• Early removal of urinary catheter, drains
• Prevent PONV (ondansetron, dexamethasone)
• VTE prophylaxis (LMWH + stockings)
• Audit outcomes

Benefits

• Reduced hospital stay by 30–50%
• Reduced complications
• Reduced opioid use
• Earlier return to work/function

ERAS Flowchart:
Pre-op optimization → Minimally invasive surgery
        → Goal-directed fluids → Early feeding
        → Multimodal analgesia → Early mobilisation
        → Reduced LOS + complications

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🟢 GI SYSTEM

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8. 🟡 NEUROENDOCRINE TUMOUR (Argentaffinoma / Carcinoid) — HHH

Sites (Mnemonic: "A-B-C" frequency)

A — Appendix (most common site, best prognosis)
B — ileum/small Bowel (most common to metastasize)
C — Colon/Colorectum
Also: stomach, lung, pancreas

Carcinoid Syndrome (occurs when mets to liver → serotonin bypasses hepatic degradation)

A — Abdominal cramps / diarrhoea
B — Bronchospasm (wheezing)
C — Cutaneous flushing (most characteristic)
D — Diarrhoea (secretory)
E — Endocardial fibrosis (right side — tricuspid/pulmonary)

• 24-hr urine 5-HIAA (5-hydroxy indole acetic acid) — screening
• Serum Chromogranin A — most sensitive tumour marker
• Octreotide scan (Somatostatin Receptor Scintigraphy) — localisation
• CT/MRI — staging

Localised → Surgical resection (curative)
  - Appendix: <2cm → appendicectomy; >2cm → right hemicolectomy
  - Small bowel: wide resection + lymphadenectomy
  
Metastatic → Octreotide/Lanreotide (symptom control)
           → PRRT (Peptide Receptor Radionuclide Therapy — Lu-177)
           → Debulking/liver resection
           → Everolimus/Sunitinib (advanced)

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9. 🟡 GIST — Gastrointestinal Stromal Tumour — HHH

Features

Risk Stratification (Miettinen & Lasota)

Size + Mitotic rate + Site → Low/Intermediate/High risk
High risk: size >10cm OR mitoses >10/50 HPF

Treatment Flowchart

Suspected GIST on CT
        ↓
EUS-guided FNA / biopsy (if resectable, may skip)
        ↓
Resectable? → YES → Surgical resection (R0)
                     (No lymphadenectomy needed — GISTs rarely LN spread)
                     ↓
             High risk? → Adjuvant IMATINIB × 3 years
                          
Unresectable/Metastatic → IMATINIB (Gleevec) 400mg/day
                          ↓ Resistance
                          SUNITINIB (2nd line)
                          ↓
                          REGORAFENIB (3rd line)

C — Cajal cell origin
K — KIT (CD117) mutation
I  — Imatinib treatment
T  — Tumour of GI tract (stomach most common)

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10. 🟡 FAMILIAL ADENOMATOUS POLYPOSIS (FAP) — HHH

Clinical Features — Mnemonic: "GADIE"

G — Gastric & duodenal polyps (periampullary cancer risk)
A — Adenomas (100+ colonic, onset puberty)
D — Desmoid tumours (mesentery/retroperitoneum)
I  — CHRPE (Congenital Hypertrophy of Retinal Pigment Epithelium)
E — Epidermoid cysts (skin), osteomas (jaw)
= Gardner's Syndrome (FAP + extraintestinal features)

Variants

Management

Diagnosis (genetic testing APC gene / colonoscopy)
        ↓
Surveillance from age 12–14 (annual sigmoidoscopy)
        ↓
Prophylactic surgery (when polyps appear)
        ↓
Surgery options:
   1. Total Proctocolectomy + Ileostomy (Brooke) — definitive
   2. Total Colectomy + Ileorectal Anastomosis (IRA) — preserves rectum (surveillance needed)
   3. IPAA — Ileal Pouch-Anal Anastomosis (J-pouch) — PREFERRED
        ↓
Chemoprevention: Sulindac / Celecoxib (reduce polyp burden pre-op)
        ↓
Screen family members (genetic counselling)

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11. 🟡 ANORECTAL MALFORMATIONS — HHH

Classification (Krickenbeck International 2005)

1. Perineal fistula (cutaneous fistula) — LOW
2. Rectourethral fistula
   a. Bulbar (less severe)
   b. Prostatic (more severe)
3. Rectovesical fistula (bladder neck) — HIGH
4. Vestibular fistula (most common in GIRLS)
5. No fistula
6. Anal stenosis

Classification by Level (Wingspread/Pena)

Associated Anomalies — VACTERL

V — Vertebral anomalies
A — Anorectal malformations
C — Cardiac defects
T — Tracheo-Esophageal fistula
E — Esophageal atresia
R — Renal anomalies
L — Limb defects

Diagnosis

• Invertogram (prone cross-table lateral X-ray) — gas bubble vs pubococcygeal line
  • Above PC line = HIGH lesion
• Perineal inspection (most important)
• USG spine + MRI (sacral anomalies, spinal cord tethering)
• Echocardiography (cardiac anomalies)
• Renal USG

Management Flowchart

Newborn → Perineal inspection
        ↓
Low lesion?                 High lesion?
     ↓                           ↓
Perineal repair           Defunctioning colostomy
(cutback/ASARP)           (Day 1–2 of life)
within 24–48 hrs                 ↓
                         PSARP at 3–6 months
                         (Posterior Sagittal Anorectoplasty - Pena)
                                 ↓
                         Colostomy closure (3 months post-PSARP)

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🟢 ABDOMINAL WALL

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12. 🟡 TAR — Transverse Abdominis Release — HHH

Anatomy

• Divide transversus abdominis (TA) muscle from its posterior rectus sheath
• Creates large myofascial advancement flap
• Allows mesh placement in retromuscular (Retzius) space — largest possible preperitoneal space

Indications

• Large midline incisional hernias (>10 cm defect)
• Loss of domain
• Failed primary repair
• Component separation needed

Technique (Novitsky)

1. Midline incision
2. Develop retromuscular plane (posterior rectus sheath released)
3. Identify and incise posterior rectus sheath
4. Release TAM (transversus abdominis muscle) 1 cm lateral to linea semilunaris
5. Enter retro-transversalis fascia / preperitoneal plane
6. Advance medial flaps → primary fascial closure
7. Large mesh in retromuscular space
8. Drain placement

Advantages over Anterior Component Separation (ACS)

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🟢 VASCULAR

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13. 🟡 MESENTERIC VASCULAR ISCHAEMIA — HHH

Classification

Clinical Features

Stage 1 (Hyperactive): Severe colicky pain, nausea, vomiting, bloody diarrhoea
Stage 2 (Paralytic): Constant pain, abdominal distension, bowel sounds absent
Stage 3 (Shock): Peritonitis, sepsis, multi-organ failure → death

P — Pain (severe, sudden, out of proportion)
A — AF / Atrial fibrillation (risk factor for embolism)
I  — Intestinal bloating / ileus (late sign)
N — Nausea & vomiting (early)

Investigations

• CT angiography = Investigation of choice (gold standard)
• Mesenteric angiography (therapeutic)
• Raised WCC, lactate (>2 = significant ischaemia)
• CXR: no pneumoperitoneum in early stages

Flowchart: Management

Suspected Mesenteric Ischaemia
        ↓
Resuscitation (IV fluids, O₂, heparin anticoagulation)
        ↓
CT Angiography
        ↓
Occlusive?              Non-occlusive (NOMI)?
    ↓                           ↓
Embolism?     Thrombosis?   Papaverine infusion
    ↓              ↓         (via angiography)
Embolectomy/   Bypass +
Thrombolysis   resection
        ↓
Bowel viable?
  YES → close
  NO  → resect + anastomosis or stoma
        ↓
Second look laparotomy at 24–48 hrs

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14. 🟡 DVT — Deep Vein Thrombosis — HHH

Pathophysiology: Virchow's Triad — "SHE"

S — Stasis (immobility, CCF, pregnancy)
H — Hypercoagulability (malignancy, OCP, Factor V Leiden, antiphospholipid syndrome)
E — Endothelial damage (trauma, surgery, central line)

Risk Factors (NICE)

• Surgery >30 min, orthopaedic surgery
• Malignancy, pregnancy, OCP/HRT
• Long-haul travel (>4 hrs)
• Previous DVT, obesity, dehydration

Well's Score (Modified)

• Score ≥2 = likely DVT
• Score <2 = unlikely DVT

Diagnosis

• Doppler USG = first-line investigation
• D-dimer (sensitive, not specific; useful to EXCLUDE if low pre-test probability)
• Venography (gold standard, rarely used)

Management Flowchart

Clinical suspicion → Well's Score
        ↓
Low probability        High probability
D-dimer negative →     USS (Doppler)
DVT excluded           ↓
                   Positive → TREAT
                       ↓
Treatment:
1. Anticoagulation:
   - LMWH (Enoxaparin) → bridge to warfarin
   - DOACs: Rivaroxaban / Apixaban (preferred now)
   - Duration: Provoked DVT = 3 months; Unprovoked = 6 months; Cancer = indefinite
2. Compression stockings (below-knee)
3. Thrombolysis (massive ilio-femoral DVT + limb threatened)
4. IVC filter (contraindication to anticoagulation)

Prophylaxis — "SCHEMES"

S — Stockings (TED stockings)
C — Compression (pneumatic)
H — Hydration (IV fluids)
E — Early mobilisation
M — LMWH (mechanical + pharmacological prophylaxis)
E — Education (avoid prolonged sitting)
S — Surgery minimally invasive when possible

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🟢 ENDOCRINE

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15. 🟡 ADRENAL TUMOUR — Classification & Management — HHH

Classification

• Adenoma (non-functional = incidentaloma; functional = Conn's, Cushing's)
• Carcinoma (rare, large >6cm, aggressive)

• Phaeochromocytoma (adult)
• Neuroblastoma (child) — from neural crest cells
• Ganglioneuroma (benign)

Rule of 10s for Phaeochromocytoma — "10% Rule"

10% bilateral
10% extra-adrenal (paraganglioma)
10% malignant
10% in children
10% familial (MEN2A, MEN2B, VHL, NF1)

Diagnosis of Phaeochromocytoma

• 24-hr urinary catecholamines / metanephrines = gold standard
• Plasma free metanephrines = most sensitive (in familial cases)
• CT/MRI localisation
• MIBG scan (meta-iodobenzylguanidine) = extra-adrenal/metastatic

Pre-operative Preparation (Critical!)

Step 1: Alpha-blockade (Phenoxybenzamine 10mg BD, titrate) × 10–14 days
Step 2: Beta-blockade ONLY after alpha blockade (propranolol)
   ⚠️ NEVER beta-block first → hypertensive crisis (unopposed alpha)
Step 3: Hydration (high-salt diet, IV fluids)
Step 4: Surgery

Adrenalectomy — Approaches

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🟢 BREAST

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16. 🟡 BREAST RECONSTRUCTION — HHH

Timing

• Immediate: At time of mastectomy — better cosmesis, fewer procedures
• Delayed: After adjuvant therapy completion

Methods — Mnemonic: "TIPS"

T — Tissue expander / Implant-based reconstruction
I  — Implant (2-stage: expander → permanent implant)
P — Pedicled flap (TRAM, LD flap)
S — Site-specific free flap (DIEP, SIEA, TUG)

Implant-Based Reconstruction

• Most common (60–70%)
• 1-stage: Direct implant placement
• 2-stage: Tissue expander → serial inflation → exchange for permanent implant
• ADM (Acellular Dermal Matrix) used for support

Autologous Flaps

• DIEP = best autologous (muscle sparing)
• LD = most reliable (but small volume)
• TRAM = large volume but abdominal wall weakness

Nipple-Areola Reconstruction (NAC)

• Delayed 3–6 months post reconstruction
• Local flap techniques (skate flap, star flap)
• Medical tattooing for areola

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🟢 CRANIAL NEUROSURGERY

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17. 🔴 EXTRADURAL HAEMATOMA (EDH) — HHH

Pathophysiology

Trauma to temporal region
        ↓
Temporal/pterion fracture (thinnest skull bone)
        ↓
Rupture of middle meningeal artery
        ↓
Arterial blood accumulates in epidural space
        ↓
Mass effect → transtentorial herniation
        ↓
Ipsilateral CN III palsy (blown pupil)
→ Contralateral hemiplegia
→ Deteriorating GCS → death

Classic Triad

1. Trauma (head injury)
2. LUCID INTERVAL (minutes to hours of apparent recovery)
3. Rapid deterioration (headache, vomiting, decreasing GCS)

L — Loss of consciousness → Lucid interval → Loss again
U — Unilateral dilated pupil (CN III compression)
C — Contralateral hemiplegia
I  — Increasing ICP signs
D — Declining GCS

CT Findings

• Biconvex (lenticular/lens-shaped) hyperdense collection
• Does NOT cross suture lines (dura attached to inner table at sutures)
• Temporal/temporoparietal region
• Midline shift

Management

ABC + ATLS protocol
        ↓
CT brain (non-contrast)
        ↓
Confirmed EDH?
        ↓
EDH >30 mL OR thickness >15mm OR midline shift >5mm?
        ↓ YES
Urgent craniotomy + evacuation (neurosurgery emergency)
(Burr hole if neurosurgeon unavailable)
        ↓ NO (small EDH, GCS 15, no focal deficit)
Conservative management + serial CT monitoring
        ↓
Post-op ICP monitoring, neuro observations

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🟢 UROLOGY

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18. 🟡 TENDER SCROTAL SWELLING — Differential Diagnosis — HHH

Causes — Mnemonic: "TEETH"

T — Torsion testis (EMERGENCY - most important to exclude!)
E — Epididymo-orchitis (infection)
E — Ectopic testis (if previously undescended)
T — Trauma (haematocele, haematoma)
H — Hernia (incarcerated/strangulated inguinal hernia)

Key Differentiation: Torsion vs Epididymo-orchitis

Flowchart: Tender Scrotal Swelling

Tender scrotal swelling
        ↓
Torsion possible? (acute onset, no fever, absent cremasteric reflex)
        ↓ YES                   ↓ NO
EMERGENCY SURGERY            Doppler USG
Surgical exploration         ↓
within 6 hrs!            Epididymo-orchitis?
(Do NOT delay for USG)        ↓ YES
        ↓                 Antibiotics
Manual detorsion          (Doxycycline/Ofloxacin + NSAIDs)
+ Bilateral orchiopexy

• 6 hrs → 100% salvage
• 12 hrs → 70% salvage
• 24 hrs → <10% salvage

• 24 hrs → orchiectomy usually needed

Fournier's Gangrene (Necrotising Fasciitis of scrotum)

• Synergistic spreading gangrene of perineum + scrotum
• Mixed aerobic-anaerobic organisms
• Treatment: URGENT wide debridement + broad-spectrum antibiotics + HBO

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🟢 LIVER

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19. 🟡 LIVER HYDATID CYST — HHH

Dog (definitive host) → eggs in faeces
        ↓
Humans ingest eggs (contaminated food/water)
        ↓
Oncosphere hatches → penetrates gut wall
        ↓
Portal circulation → Liver (most common 70%) or lung (20%)
        ↓
Develops into hydatid cyst (may take years)

Cyst Structure

├── Pericyst (host-derived fibrous layer)
├── Ectocyst (laminated membrane — white, eggshell)
└── Endocyst (germinal/inner layer — produces scolices + daughter cysts)
    └── Brood capsules → protoscolices → daughter cysts

WHO Classification (CE 1–5)

Clinical Features

• RUQ pain/mass (most common)
• Jaundice (biliary communication)
• Anaphylaxis (rupture into peritoneum — life-threatening)
• Daughter cysts on imaging

Investigations

• USG (Gharbi classification) = first line
• CT — defines anatomy, daughter cysts, calcification
• Casoni test (intradermal) — outdated
• Echinococcus IgG ELISA = most sensitive serological test
• Eosinophilia (25–30% cases)

Management — "PAIR + Surgery"

1. Puncture cyst under USG guidance
2. Aspirate cyst fluid (microscopy for scolices)
3. Inject scolicidal agent (20% NaCl / 95% ethanol / cetrimide)
4. Re-aspirate after 15–20 mins
Cover with Albendazole 400mg BD (4 days before → 1 month after)

• PAIR = CE1, CE3a (WHO recommended for uncomplicated)
• Laparoscopic deroofing/pericystectomy = CE2, CE3b
• Open surgery = complicated (biliary communication, rupture, large/multi)
• Total pericystectomy = ideal (removes entire cyst)
• Inject scolicide before any incision (prevent spillage → anaphylaxis)

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🟢 PAEDIATRIC

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20. 🟡 UNDESCENDED TESTIS (Cryptorchidism) — HHH

Normal Descent

Genital ridge (week 6)
        ↓
Inguinal canal (month 3)
        ↓
Scrotum (month 7–8 of gestation)
Guided by: Gubernaculum + INSL3 hormone + Testosterone + Calcitonin gene-related peptide

Classification

Impalpable (20%)         Palpable (80%)
     ↓                        ↓
Intra-abdominal (50%)    Ectopic (outside normal path)
Absent/atrophic (50%)    Retractile (normal variant)
                         Arrested descent (canalicular/superficial pouch)

P — Perineum
R — Root of penis
I  — Inguinal (superficial pouch - most common ectopic)
S — Supra-pubic
M — Medial thigh / femoral

Complications — Mnemonic: "MATHS"

M — Malignancy (risk ×10 vs normal; seminoma most common)
A — Atrophy / infertility (damage to germinal cells >2 years)
T — Torsion (increased risk — horizontal lie)
H — Hernia (patent processus vaginalis)
S — Subfertility (bilateral > unilateral)

Management

Newborn UDT discovered:
        ↓
Observe until 6 months (spontaneous descent may occur)
        ↓
Still undescended at 6 months?
        ↓
Refer for ORCHIDOPEXY
        ↓
Timing: 6–18 months (ideally before 12 months per UK guidelines)
(Previously 2 years — now earlier to preserve fertility)
        ↓
Palpable (inguinal): Standard inguinal orchidopexy (Fowler-Stephens if short pedicle)
Impalpable: Laparoscopy → assess
   ↓ Intra-abdominal → 2-stage Fowler-Stephens orchidopexy
   ↓ Absent/atrophic → exploration + prosthesis later

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📊 QUICK SUMMARY TABLE — Part B High-Yield Topics

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Source references: Bailey & Love's Short Practice of Surgery 28th Ed | Current Surgical Therapy 14e | Mulholland & Greenfield's Surgery 7e | Harrison's Principles of Internal Medicine 22E

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✅ What Was Covered

1. TPN - Composition, indications, MICA complications, refeeding syndrome, monitoring
2. Blood Transfusion - WFPC products, INCH TAILS complications, MTP 1:1:1 ratio
3. Burns Assessment - Rule of 9s, Lund & Browder, Parkland formula flowchart
4. Hand Infections - Kanavel's 4 signs, space anatomy, DEAD management

1. Robotic Surgery - WRIST 3D advantages, Da Vinci components, applications
2. Energy Sources - ELMU classification, electrosurgery hazards, harmonic scalpel, lasers
3. ERAS - Full pre/intra/post-op protocol with benefits

1. Carcinoid/NET - APUD cells, ABCDE syndrome, 5-HIAA, grading, PRRT
2. GIST - c-KIT mutation, imatinib flowchart, risk stratification
3. FAP - APC gene, GADIE features, Gardner/Turcot variants, IPAA surgery
4. Anorectal Malformations - VACTERL, Krickenbeck classification, PSARP, management flowchart

1. TAR - Technique, posterior component separation, vs anterior CS comparison

1. Mesenteric Ischaemia - PAIN mnemonic, CT angio, 3-stage progression, second-look
2. DVT - Virchow's SHE triad, Well's score table, DOAC treatment, SCHEMES prophylaxis

1. Adrenal Tumour - Rule of 10%, alpha THEN beta blockade (critical!), adrenalectomy approaches

1. Breast Reconstruction - TIPS methods, DIEP vs LD vs TRAM comparison table

1. Extradural Haematoma - MMA rupture, LUCID mnemonic, biconvex CT, EDH vs SDH table, management

1. Tender Scrotal Swelling - Torsion vs Epididymo-orchitis table, "time is testicle" salvage rates

1. Liver Hydatid Cyst - Life cycle, CE staging, PAIR procedure, albendazole

1. Undescended Testis - MATHS complications, ectopic PRISM sites, orchidopexy timing

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