Cholelithiasis with Swelling in the Back - Viva Q&A

The Classic Viva Question

The Diagnosis: Pericholecystic/Retroperitoneal Abscess (Psoas Abscess OR Cold Abscess from Spinal Caries)

Empyema of the Gallbladder -> Perforation -> Retroperitoneal/Subhepatic Abscess -> Pointing in the Loin/Back

Why Does a Swelling Appear in the Back?

Mechanism - Step by Step

1. Gallstone impacts the cystic duct - causes obstruction
2. Acute cholecystitis develops - inflammation, pus, wall necrosis
3. Empyema of the gallbladder - pus fills the gallbladder
4. Perforation of the gallbladder wall (due to pressure necrosis / gangrene)
5. The gallbladder is retroperitoneal/subhepatic in position - pus tracks posteriorly along the right paracolic gutter or retroperitoneal space into the right loin / lumbar region
6. This presents as a swelling in the loin or back - fluctuant, pointing through the skin

• Bailey and Love's Surgery, p.1265: "If resolution does not occur, empyema of the gallbladder may result. The wall may become necrotic and perforate, with the development of localised peritonitis."

Types of Gallbladder Perforation (Niemeier Classification)

Differential Diagnosis of "Back Swelling" in Cholelithiasis

• S Das A Manual on Clinical Surgery, p.527: "A hepatic, subphrenic or perigastric abscess may burrow through the anterior abdominal wall to form a parietal abscess" - the same principle applies posteriorly.

Key Viva Points You Must Know

1. Pain Radiation in Cholelithiasis

• Pain originates in RUQ/epigastrium
• Radiates to right shoulder (via phrenic nerve, C3-C5 dermatome)
• Radiates to tip of right scapula / interscapular region / mid-back (via T7-T9 intercostal nerves)
• This is referred pain, NOT a swelling

2. Mucocele vs Empyema

• Mucocele: Complete cystic duct obstruction, bile reabsorbed, mucus secreted - sterile, non-tender, smooth swelling in RUQ (Courvoisier's-like but tender history) - Bailey & Love, p.1265
• Empyema: Same obstruction + infection - painful, tender, patient is febrile, can perforate

3. Signs of Empyema/Perforation

• High swinging fever
• Rigors
• Worsening pain or sudden improvement (if perforation decompresses)
• Palpable tender mass
• Septic shock if untreated

4. Courvoisier's Law (often asked next)

• "In the presence of jaundice, if the gallbladder is palpable, it is unlikely to be due to stone disease"
• Gallstones cause chronic inflammation and fibrosis - the GB wall cannot distend
• Exception: mucocele of GB with concurrent CBD stone

5. Investigation to Order

• USG abdomen - first line; shows stones (>95% sensitivity for >4mm stones), wall thickening, pericholecystic fluid
• CECT abdomen - identifies abscess, its extent, tracking to loin
• CBC - leukocytosis
• LFTs - may be deranged if Mirizzi syndrome/CBD involvement

6. Treatment of Empyema with Loin Abscess

• IV antibiotics (broad-spectrum: cover gram-negatives and anaerobes)
• Percutaneous drainage of the abscess under USG/CT guidance
• Cholecystectomy - definitive treatment (laparoscopic or open depending on patient stability)
• May need staged procedure: drain first, cholecystectomy later

Murphy's Sign (Always Asked in Cholelithiasis Viva)

• Examiners stop inspiration by deep palpation in the right subcostal region during inspiration
• Inflamed gallbladder descends against the palpating hand - causes pain, arrests inspiration
• Positive = acute cholecystitis

Summary Answer for Viva

"In cholelithiasis, a gallstone impacting the cystic duct causes obstruction and acute cholecystitis. If the gallbladder becomes gangrenous and perforates (empyema), pus can track retroperitoneally along fascial planes and point as a fluctuant swelling in the right loin or lumbar region. This is a Type II (walled-off/pericholecystic) perforation. It is treated with percutaneous drainage and definitive cholecystectomy."

Detailed Inspection & Palpation in Cholelithiasis (Viva Answer)

INSPECTION

1. General Appearance of the Patient

• Build: Often a fat, female patient of forty (the classic "5 Fs" - Fat, Female, Fertile, Fair, Forty) - though this rule has limited diagnostic value in isolation
• Nutritional status: Generally well-nourished in uncomplicated cholelithiasis
• Facies: May appear anxious, in pain, or restless during an acute attack
• Pallor: Usually absent unless there is associated haemolysis (pigment stones in haemolytic anaemia)

2. Jaundice / Icterus

• Scleral icterus - first visible sign of jaundice (bilirubin >2 mg/dL)
• Mild yellow tinge may be present if there is associated:
  • Choledocholithiasis (stone in CBD)
  • Mirizzi syndrome (external compression of CBD)
  • Associated cholangitis
• Skin: Yellow discolouration
• Scratch marks on the skin - due to pruritus from bile salt deposition in obstructive jaundice (choledocholithiasis)
• Dark urine + pale/clay-coloured stools - signs of obstructive jaundice (ask or observe)

3. Abdomen - Inspection

• S Das Manual on Clinical Surgery, p.513: "Inspection reveals a normally looking abdomen" in chronic cholecystitis/cholelithiasis.

PALPATION

Preconditions for Palpation

• Patient supine, hips and knees flexed (to relax abdominal muscles)
• Hand warm, flat on abdomen
• Start away from the site of pain - begin at the left iliac fossa, move systematically to the right hypochondrium last
• Observe the patient's face throughout for signs of discomfort

A. Light Palpation - Tenderness

1. Right Hypochondriac / Right Upper Quadrant Tenderness

• The primary area of tenderness in cholelithiasis / cholecystitis
• Tenderness at the junction of the right rectus abdominis with the costal margin (gallbladder point)
• In chronic cholecystitis: mild tenderness on deep palpation

2. Murphy's Sign (MOST IMPORTANT SIGN)

1. Place the examining hand (or two fingers) in the right subcostal region, below the tip of the 9th costal cartilage
2. Ask the patient to take a deep breath in
3. The descending liver and gallbladder press against the palpating fingers
4. Positive Murphy's sign: Patient experiences sudden sharp pain and arrests inspiration abruptly (inspiratory catch)

• Positive = Acute cholecystitis (sensitivity 65%, specificity 87%)
• Negative Murphy's sign does NOT exclude gallstones
• In chronic cholecystitis, Murphy's sign may be mild or absent

"The most important sign is that of Murphy... In the majority of cases the gallbladder is not palpable unless a mucocele or empyema develops." - S Das Manual on Clinical Surgery, p.513

• Hyperaesthesia (increased sensitivity to touch) in the right infrascapular region (back)
• Referred tenderness from gallbladder disease via T7-T9 dermatomes
• Positive Boas' sign = tenderness in the right lumbar/infrascapular region on palpation from behind

B. Deep Palpation - Gallbladder

• Felt as a tense globular swelling projecting downward and forward from below the liver
• Lies just lateral to the outer border of the right rectus muscle (below the tip of the 9th rib)
• Moves freely with respiration (moves downward on inspiration)
• Upper limit is continuous with the liver dullness
• Can be moved slightly from side to side (distinguishes from kidney which moves up/down only)

C. Courvoisier's Law (Palpation Sign)

1. Double impaction of stones (one in cystic duct + one in CBD)
2. Mucocele of gallbladder (stone in cystic duct with concurrent CBD stone)
3. Oriental cholangiohepatitis
4. Pancreatic calculus obstructing the ampulla of Vater

D. Other Palpation Findings in Complications

E. Palpation of Liver

• Enlarged liver = consider hepatic involvement (e.g. ascending cholangitis with liver abscess)
• Tender liver = amoebic hepatitis/abscess (in differential)
• Nodular hard liver = metastases (e.g. from GB carcinoma)

Summary Table - Inspection vs Palpation

Cholelithiasis - Complete Viva Q&A

OPENING THE CASE

"This is a 42-year-old obese female who presents with recurrent attacks of colicky pain in the right upper quadrant, radiating to the tip of the right scapula, aggravated by fatty food, with nausea and flatulence. On examination, she is mildly icteric, Murphy's sign is positive, and the gallbladder is not palpable. Provisional diagnosis: Cholelithiasis with chronic cholecystitis."

SECTION 1: DEFINITION & EPIDEMIOLOGY

• Affects 10-20% of adults in Western countries
• 20-40% in Latin American countries
• Only 3-4% in Asian countries (predominantly pigment stones)
• About 1 million new cases annually in the USA
• 70-80% remain asymptomatic throughout life - Robbins Basic Pathology

• Oral contraceptive pills (estrogen increases hepatic cholesterol secretion)
• Rapid weight loss / bariatric surgery
• Ileal disease (Crohn's) or ileal resection - depletes bile salt pool
• Haemolytic anaemia (pigment stones - sickle cell, hereditary spherocytosis)
• Cirrhosis
• Gallbladder hypomotility (spinal cord injury, TPN, prolonged fasting)
• Family history (~25% genetic contribution) - Robbins Basic Pathology

SECTION 2: TYPES OF GALLSTONES

"The very small stones ('gravel') are more dangerous because they can enter the cystic or common duct and cause obstruction." - Robbins Basic Pathology, p.630

SECTION 3: PATHOGENESIS

1. Supersaturation of bile with cholesterol (lithogenic bile)
2. Nucleation - cholesterol crystals precipitate out of solution
3. Gallbladder hypomotility - stasis allows crystal aggregation and growth; mucus traps crystals

• Increased unconjugated bilirubin in bile (from haemolysis or biliary infection)
• Unconjugated bilirubin + calcium → insoluble calcium bilirubinate
• Bacterial phospholipases (in brown stones) release fatty acids → calcium soaps

SECTION 4: SYMPTOMS

• Site: Right upper quadrant or epigastrium
• Radiation: Tip of right scapula (via T7-T9 intercostal nerves); right shoulder (via phrenic nerve)
• Character: Colicky, but classically constant and severe (not truly intermittent)
• Onset: Typically at night, waking the patient; triggered by fatty meals
• Duration: Minutes to hours
• Associated: Nausea, vomiting (which does NOT relieve pain - unlike peptic ulcer)
• Relieved by: Analgesics; stone slipping back into GB body

SECTION 5: EXAMINATION

• Usually normal-looking abdomen
• Mild scleral icterus (if associated cholangitis/CBD stone)
• Scratch marks (obstructive jaundice component)
• Fullness in RUQ if empyema/mucocele

• Deep palpation in the right subcostal region during inspiration
• Positive = pain + sudden arrest of inspiration as the inflamed gallbladder descends onto the examining fingers
• Sensitivity 65%, Specificity 87%
• Indicates acute cholecystitis

• Mucocele (non-tender, tense, globular)
• Empyema (very tender, patient febrile)

SECTION 6: INVESTIGATIONS

Bedside

• Urine: Bile salts + bile pigments (obstructive jaundice)
• Stool: Clay-coloured (obstructive pattern)

Blood

• CBC: Leukocytosis in cholecystitis/cholangitis
• LFTs: Raised ALP, GGT (obstructive); raised bilirubin (choledocholithiasis); raised transaminases if hepatic involvement
• Serum amylase/lipase: Raised if gallstone pancreatitis

Imaging (in order of preference)

• Echogenic (bright) foci within the GB lumen
• Posterior acoustic shadowing (most specific sign)
• Gravity-dependent movement (stones shift with patient positioning)
• Wall thickening (>3mm) = cholecystitis

SECTION 7: COMPLICATIONS (Very High Yield)

LOCAL

DUCTAL

DISTANT / RARE

"The larger the stone, the less likely it is to enter the cystic or common ducts; thus the very small stones or 'gravel' are more dangerous." - Robbins Basic Pathology

SECTION 8: TREATMENT

Definitive: Laparoscopic Cholecystectomy (Gold Standard)

• 4-port technique (10mm umbilical camera; 5mm ports in epigastrium, RUQ)
• Calot's triangle dissected: Cystic duct + cystic artery identified, clipped, divided
• "Critical view of safety" achieved before any clipping
• Day-care or 1-2 day admission
• Conversion to open: 5% (difficult dissection, bleeding, bile duct injury)

• Boundaries: Cystic duct (below), common hepatic duct (medially), liver undersurface (above)
• Contents: Cystic artery, cystic lymph node (Lund's node), sometimes right hepatic artery

• Two structures seen entering the gallbladder base before clipping
• Lower 1/3 of gallbladder dissected free from the liver bed
• Hepatocystic triangle cleared of fat and fibrous tissue
• Prevents bile duct injury

Medical / Non-Surgical Options (limited role)

Acute Cholecystitis Management

1. NPO + IV fluids
2. IV antibiotics (cover gram-negatives + anaerobes: e.g. Cefuroxime + Metronidazole)
3. Analgesia (NSAIDs / Opioids)
4. Early laparoscopic cholecystectomy within 72 hrs (preferred) or interval cholecystectomy (6-8 weeks)

SECTION 9: BONUS HIGH-YIELD VIVA QUESTIONS

1. Pneumobilia (air in biliary tree)
2. Small bowel obstruction
3. Ectopic calcified gallstone (usually at terminal ileum)

• Failed laparoscopy (bleeding, bile duct injury)
• Suspected GB carcinoma (port site metastasis risk)
• Cirrhosis with portal hypertension
• Empyema with dense adhesions
• Mirizzi syndrome

Cholelithiasis - Viva Questions & Answers

🔵 ANATOMY QUESTIONS (Examiners love these)

• Fundus - projects below the liver edge at the tip of the right 9th costal cartilage
• Body - main storage portion
• Infundibulum (Hartmann's pouch) - lower expanded part; where stones commonly lodge
• Neck - narrows into the cystic duct; contains the spiral valve of Heister

• Arterial: Cystic artery (branch of right hepatic artery in 75%; variable in 25%)
• The cystic artery runs through the triangle of Calot and bifurcates into anterior and posterior branches near the GB neck
• Venous: Cystic vein → directly drains into the intrahepatic middle hepatic vein (via cystic plate)
• Current Surgical Therapy 14th Ed., p.560

• Sympathetic: From T9 segment + celiac plexus; also from the right phrenic nerve (explains referred pain to the right shoulder)
• Parasympathetic: Hepatic branch of the anterior vagus nerve
• Current Surgical Therapy, p.558

🔵 PHYSIOLOGY QUESTIONS

• Storage and concentration of bile (concentrates 10-fold by absorbing water and electrolytes)
• Stores 30-50 mL bile in fasting state (up to 100 mL when fully distended)
• Contracts in response to cholecystokinin (CCK) released by I-cells in the duodenum when fat/protein enters
• Simultaneous relaxation of the sphincter of Oddi → bile delivered into the duodenum
• Function of bile: emulsification of dietary fats to allow lipase activity

• Water (~97%)
• Bile salts (bile acids conjugated with glycine/taurine)
• Phospholipids (lecithin)
• Cholesterol
• Bilirubin
• Electrolytes

🔵 PATHOGENESIS QUESTIONS

1. Supersaturation - excess cholesterol secretion / reduced bile salts → lithogenic bile
2. Nucleation - cholesterol crystals precipitate (promoted by nucleating factors like mucin glycoproteins)
3. Stone growth - crystal aggregation in a stagnant (hypomotile) gallbladder

• Black stones (sterile bile): Haemolytic anaemia (sickle cell, spherocytosis) → excess unconjugated bilirubin → calcium bilirubinate precipitation. Also in cirrhosis (reduced bile acid synthesis)
• Brown stones (infected bile): Bacterial/parasitic infection of bile ducts (E. coli, Clonorchis sinensis) → bacterial β-glucuronidase deconjugates bilirubin glucuronide → precipitates as calcium bilirubinate in the ducts

🔵 CLINICAL QUESTIONS

1. Right upper quadrant pain
2. Jaundice (obstructive)
3. Fever with rigors

• Obstructive jaundice
• Recurrent cholangitis
• No palpable GB (chronically fibrosed)

• Type I: Stone extrinsically compresses CHD
• Type II: Stone erodes into CHD (≤1/3 circumference fistula)
• Type III: Fistula involving >1/3 but <2/3 circumference
• Type IV: Complete destruction of CHD wall

🔵 INVESTIGATIONS QUESTIONS

• Sensitivity >95% for stones >4 mm
• Classic finding: Echogenic foci with posterior acoustic shadowing, moving with gravity
• Also shows: GB wall thickness, pericholecystic fluid, CBD diameter, Murphy's sign on probe pressure (sonographic Murphy's sign)

1. Pneumobilia (air in the biliary tree - from cholecystenteric fistula)
2. Small bowel obstruction (dilated loops, air-fluid levels)
3. Ectopic calcified gallstone (usually visible in right lower quadrant at terminal ileum - commonest site of impaction)

• Sleisenger & Fordtran's GI and Liver Disease

• Confirm and locate CBD stones (choledocholithiasis)
• Assess biliary anatomy before surgery
• Identify strictures, Mirizzi syndrome, cholangiocarcinoma

🔵 TREATMENT QUESTIONS

• Porcelain gallbladder (selective/patchy calcification → 2-3% risk of GB carcinoma) - Yamada's GI Textbook
• Gallstone >3 cm (higher carcinoma risk)
• Gallbladder polyp >10 mm (coexisting malignancy risk)
• Haemolytic anaemia patients undergoing splenectomy (concurrent cholecystectomy)
• Immunocompromised patients (transplant, HIV)
• Diabetes mellitus (some guidelines - risk of complications higher)
• Congenital spherocytosis before splenectomy
• Anomalous pancreaticobiliary junction

1. Port placement: 4 ports - 10mm umbilical (camera), 10mm epigastric (working), 5mm right subcostal, 5mm right lateral
2. Exposure: Patient in reverse Trendelenburg + left lateral tilt; fundus retracted superiorly
3. Dissection of Calot's triangle: Peritoneum incised, fatty/fibrous tissue cleared
4. Critical View of Safety (CVS): Two structures (cystic duct + cystic artery) seen entering GB; lower 1/3 of GB free from liver bed
5. Clip and divide: 2 clips proximally, 1 distally on cystic duct; same on cystic artery
6. GB dissection off liver bed (electrocautery)
7. Extraction through umbilical port (endobag for infected/carcinomatous GB)
8. Haemostasis + drain placement (if needed)

1. The hepatocystic triangle is completely cleared of fat and fibrous tissue
2. The lower 1/3 of the gallbladder is dissected free from the liver bed
3. Only two structures are seen entering the gallbladder (cystic duct + cystic artery)

• Current Surgical Therapy 14th Ed.

• Uncontrolled bleeding
• Bile duct injury identified
• Dense adhesions (cannot safely identify anatomy)
• Suspected/confirmed GB carcinoma
• Empyema with gangrenous wall
• Mirizzi syndrome (type II-IV)
• Intraoperative cholangiogram showing complex anatomy

🔵 SPECIAL SCENARIOS

• Large gallstone (>2.5 cm) erodes through the inflamed GB wall into the adjacent duodenum (cholecystoduodenal fistula - most common)
• Stone passes into the small bowel and impacts at the narrowest point - terminal ileum (or ileocaecal valve)
• Causes mechanical small bowel obstruction
• Rare (1-3% of GB complications) but high mortality (15-25%)
• X-ray: Rigler's triad

• Critically ill ICU patients (prolonged TPN, major surgery, burns, trauma, sepsis)
• Mechanism: GB stasis + ischaemia + bile concentration → mucosal injury → superinfection
• Diagnosis by USG (thickened wall, pericholecystic fluid, no stones) or HIDA scan (non-visualisation)
• Mortality high (>30%) if gangrenous; treatment: cholecystostomy (drainage) or emergency cholecystectomy