Gallbladder & Biliary System
Applied biliary anatomy, gallstone disease and operative principles for MRCS Part A & B.
Biliary Anatomy & Physiology
Bile is a physiological solution produced and secreted by hepatocytes at approximately 500–1000 mL/day. Its primary function is emulsification of dietary fat, vastly increasing the surface area available for pancreatic lipase. It also excretes cholesterol and bilirubin.
| Component | Function | Clinical Significance |
|---|---|---|
| Bile acids/salts (67%) | Amphipathic detergents — emulsify fat into micelles. Hydrophobic side binds fat; hydrophilic side faces the aqueous environment, keeping fat droplets separated and forming micelles for absorption at the terminal ileum. | Loss (Crohn’s, ileal resection) → reduced bile salt pool → cholesterol supersaturation → gallstone formation + secretory diarrhoea |
| Phospholipids (22%) | Lecithin — co-emulsifier. Keeps cholesterol solubilised in bile. | Imbalance → cholesterol precipitation → stone nucleation |
| Cholesterol (4%) | Eliminated via excretion as bile acid — maintains cholesterol homeostasis. | Supersaturation is the first step in cholesterol stone formation |
| Conjugated bilirubin | Waste product of haem metabolism — excreted in bile → stercobilin (faeces) and urobilinogen (urine). | Obstruction → conjugated hyperbilirubinaemia + pale stools + dark urine + pruritus |
| Water + Electrolytes | Solvent. Ductal cells (cholangiocytes) add bicarbonate (stimulated by secretin). | Biliary bicarbonate secretion = “bicarbonate umbrella” protecting ductal cells from acid |
After facilitating fat absorption, approximately 95% of bile acids are actively reabsorbed in the terminal ileum (via the ASBT transporter) → portal venous blood → liver → reconjugated and re-secreted. This recycling occurs 6–8 times daily, maintaining the bile acid pool without requiring full de novo synthesis.
Why Terminal Ileal Disease Causes Gallstones
Crohn’s disease, ileal resection, or radiation damage impairs active bile acid reabsorption → bile acid pool shrinks → bile becomes cholesterol-supersaturated → cholesterol stone formation. Bile acids reaching the colon cause secretory diarrhoea (bile acid malabsorption). This is why Crohn’s patients have dramatically higher gallstone rates.
Haemoglobin → Biliverdin
Haem oxygenase cleaves the porphyrin ring of haemoglobin to yield biliverdin (green). This occurs in macrophages of the spleen, liver, and bone marrow.
Biliverdin → Conjugated Bilirubin
Biliverdin reductase reduces biliverdin to unconjugated bilirubin. In hepatocytes, UGT1A1 (UDP-glucuronosyltransferase) conjugates bilirubin with glucuronic acid → water-soluble conjugated bilirubin → excreted into bile.
Urobilinogen → Stercobilin & Urobilin
Conjugated bilirubin in the intestinal lumen is deconjugated and reduced by gut bacteria to urobilinogen. Most is oxidised to stercobilin (brown stool pigment). A small amount is reabsorbed, re-excreted by the liver, or excreted in urine as urobilin (gives urine its yellow colour). In obstructive jaundice: no bilirubin reaches the gut → pale/clay-coloured stools + urobilinogen absent from urine.
Interpreting Jaundice — Pre-hepatic, Hepatic, or Post-hepatic?
Pre-hepatic (haemolytic): Unconjugated bilirubin overwhelms hepatic conjugation. Urobilinogen ↑ in urine, normal stool colour, NO conjugated bilirubin in urine. → Black pigment stones.
Hepatic (hepatocellular): Mixed picture — both fractions rise. ALT/AST markedly elevated.
Post-hepatic (obstructive): Conjugated bilirubin cannot reach gut → pale stools (no stercobilin), dark urine (conjugated bilirubin is water-soluble → spills into urine), pruritus (bile salt deposition). ALP and GGT markedly elevated. ALT only mildly elevated. NO urobilinogen in urine.
Gallbladder — Labelled Anatomy
The pear-shaped gallbladder sits in the gallbladder fossa on the visceral liver surface, right of the ligamentum teres. Capacity: 30–50 mL. Attached to the liver by loose fibro-areolar tissue. Sections: fundus (projects beyond liver edge) → body (overlies duodenum and transverse colon posteriorly) → neck (tapers to cystic duct; contains Hartmann’s pouch where stones most commonly lodge).
- F
Fundus
Projects beyond the inferior edge of the liver. The palpable part in a distended gallbladder (Courvoisier’s sign). Aligns with the right 9th costal cartilage tip.
- B
Body
Lies in contact with the liver bed (cystic plate). Posteriorly related to D1 duodenum and transverse colon — explains cholecystoduodenal fistula formation in recurrent cholecystitis.
- N
Neck + Hartmann’s Pouch
The neck tapers into the cystic duct. Hartmann’s pouch is the mucosal outpouching at the neck–body junction — the most common site for gallstones to lodge (biliary colic or cholecystitis). A stone here compressing the CHD = Mirizzi syndrome.
Microscopic Wall Structure (inside → out)
Mucosa (single layer of tall columnar epithelium + Rokitansky-Aschoff sinuses) → Lamina propria → Muscular layer (smooth muscle: circular, oblique, longitudinal) → Serosa (visceral peritoneum — covering the free inferior surface only; the hepatic surface has no peritoneum).
Relations
| Direction | Relation |
|---|---|
| Anteriorly / superiorly | Inferior edge of the liver |
| Posteriorly | Duodenum (D1) and transverse colon — risk of fistula formation |
| Inferiorly | Remainder of biliary tree + duodenum + transverse colon |
Distal Biliary Ducts & Sphincter Distribution — “Tube Map” Style
The CBD and main pancreatic duct converge to form the hepatopancreatic ampulla (ampulla of Vater), opening at the major duodenal papilla in D2 (~7 cm from the pylorus). The sphincter of Oddi surrounds the ampulla — contracts during fasting (bile diverted to gallbladder for storage/concentration), relaxes post-meal in response to CCK. In 85% of people the CBD and pancreatic duct share a common channel at the ampulla.
- 1
Bile canaliculi → Canals of Hering → Interlobular bile ducts
Hepatocytes secrete bile into canaliculi → Canals of Hering (lined by hepatocytes + cholangiocytes) → interlobular ducts running in portal triads with the portal vein and hepatic artery branches.
- 2
Right & Left Hepatic Ducts
Emerge at the porta hepatis. Right drains Couinaud segments V–VIII; left drains segments I–IV.
- 3
Common Hepatic Duct (CHD)
Right + left hepatic ducts unite at the porta hepatis. Length ~3–4 cm. Travels in the free edge of the lesser omentum.
- 4
Common Bile Duct (CBD)
CHD + cystic duct → CBD. Normal diameter ≤6 mm (up to 8 mm post-cholecystectomy or elderly). Spiral valve of Heister in the cystic duct. Three segments: supraduodenal (hepatoduodenal ligament) → retroduodenal (behind D1) → infraduodenal/intrapancreatic (embedded in pancreatic head → compressed by pancreatic carcinoma).
- 5
Ampulla of Vater + Sphincter of Oddi
CBD + main pancreatic duct (Wirsung) converge at the major duodenal papilla in D2. The sphincter of Oddi controls bile and pancreatic juice release — contracts during fasting, relaxes with CCK post-meal.
The hepatoduodenal ligament is the free edge of the lesser omentum. It contains the portal triad:
- CBD — right and anterior
- Hepatic artery proper — left and anterior
- Portal vein — posterior and central
foramen of winslow and hepaticoduodenal ligament and structures involved in a pringle maneouver.
A portal triad of CBD (right and anterior), hepatic artery proper (left and anterior) and portal vein (posterior and central)
Pringle’s manoeuvre: compressing the hepatoduodenal ligament between the index finger (in the epiploic foramen) and thumb → simultaneously occludes all three structures → temporary arrest of hepatic inflow. Used during liver resection to control haemorrhage. The epiploic foramen (foramen of Winslow) lies immediately posterior to the hepatoduodenal ligament.
Calot’s Triangle (Original Description)
Borders: Superior — cystic artery · Lateral — cystic duct · Medial — hepatic duct.
Contents: Calot’s (Lund’s) lymph node. The original Calot’s triangle has the cystic artery as its superior border — this is the historical definition less used in modern surgery.
Hepatocystic Triangle (Modern Surgical Definition)
Borders: Superior — inferior edge of liver · Lateral — cystic duct · Medial — common hepatic duct.
Contents: Cystic artery (must be identified and clipped) + Calot’s/Lund’s node. The Critical View of Safety (CVS) must be achieved in this space before any clipping.
Cystic Artery Origin — Coeliac Axis “Metro Map”
The cystic artery normally arises from the right hepatic artery (→ hepatic artery proper → common hepatic artery → coeliac axis → aorta). The gallbladder also receives a secondary supply from the cystic plate of the liver. The cystic artery anatomy is highly variable — approximately 30% of patients have an anatomical variant. The most dangerous: the right hepatic artery forming a caterpillar hump (Moynihan’s hump) in the hepatocystic triangle, mimicking the cystic artery.
| Structure | Detail | Surgical Pearl |
|---|---|---|
| Cystic artery (main) | Branch of the right hepatic artery (RHA). Runs posterior to the cystic duct in the hepatocystic triangle. | Variable origin — may arise from left hepatic artery, GDA, main hepatic artery, or coeliac axis. Always confirm before clipping. |
| Secondary supply | Direct arterial branches from the cystic plate (liver bed). | Explains why subtotal cholecystectomy can still leak bile from the liver bed (small Ducts of Luschka). |
| Lymphatics | Two chains: (1) between CBD and portal vein; (2) between hepatic artery and portal vein. First sentinel node = Calot’s/Lund’s node overlying the cystic artery insertion. | GB cancer lymphadenectomy requires skeletonisation of the CBD, portal vein, and hepatic artery with removal of all nodes above the duodenum. |
| Nerve supply | Sensory + sympathetic: coeliac plexus. Parasympathetic (motility): vagus (CN X). CCK stimulates contraction via vagal pathways. | Pain refers to right shoulder/scapula tip (phrenic nerve, C3-5). Explains right shoulder tip pain in biliary colic and cholecystitis. |
Approximately 30% of patients undergoing laparoscopic cholecystectomy have an anatomical variation. Misidentification is the leading cause of iatrogenic bile duct injury.
Gallbladder Variations
Normal Gallbladder
Standard position in the gallbladder fossa, right of the ligamentum teres.
Gallbladder Diverticulum
Rare anomaly — a diverticular outpouching from the gallbladder wall. Can be mistaken for Hartmann’s pouch.
Intrahepatic Gallbladder
Entire circumference surrounded by liver parenchyma. Cholecystectomy risks major hepatic bleeding and bile leakage from ducts of Luschka.
Cystic Duct Variations
Normal Cystic Duct
Standard arrangement. The cystic artery (orange) lies posterior to the cystic duct, in the hepatocystic triangle. The normal cystic duct is 2–4 cm long.
Angular Insertion — 70% (Normal)
The cystic duct joins the CHD at a wide angle. The most common configuration. Easiest to dissect and clip safely.
Parallel Insertion — ~20%
Long cystic duct runs parallel alongside the CHD/CBD before joining. ⚠️ Can be mistaken for the CHD → inadvertent CBD clipping if not careful.
Spiral Cystic Duct — ~10%
The cystic duct spirals around the CHD before joining it. Can cross anteriorly. Extreme care needed to avoid CHD injury when clipping.
Long Cystic Duct (>4 cm)
Advantageous for manipulation and clipping — BUT a long spiralling duct is difficult to identify and increases the risk of CHD injury.
Cystic Duct → Right Hepatic Duct (Rare)
The cystic duct inserts directly into the right hepatic duct rather than the CHD. Division risks occluding the right hepatic duct → Strasberg type B ductal injury → right lobe infarction.
Cystic Artery Variations
Cystic Artery Anterior to Duct
If pulsation is not clearly visible, this vessel can be difficult to identify. ⚠️ May be confused with a fibrous band or missed entirely.
Double Cystic Artery (~15%)
⚠️ Can cause serious haemorrhage if only the first artery is clipped and the second is inadvertently divided without clips. Always check for a second artery before proceeding.
Cystic Artery from Liver Parenchyma
Arises directly from the liver parenchyma — no discrete pedicle available for clipping. Risk of liver bed haemorrhage. Requires diathermy or suture ligation.
Caterpillar Hump / Moynihan’s Hump
The right hepatic artery (or rarely the cystic artery) forms a loop (“caterpillar hump”) that bulges into the hepatocystic triangle. ⚠️ Misidentification and division of the right hepatic artery = devascularisation of the entire right lobe of the liver. Always confirm pulsation before clipping.
Cystic Artery Hump Variant
Another appearance of a tortuous or looped cystic artery variant. Always trace the vessel fully before applying any clips.
Double Cystic Duct
Rare anomaly. Two separate cystic ducts draining the gallbladder. Risk of incomplete clip occlusion and bile leak if the second duct is not identified and secured.
Gallstone Disease
Gallstones (cholelithiasis) affect approximately 1 in 12 people in Western populations. The majority remain asymptomatic. Clinical presentation depends entirely on where in the biliary system the stone lodges.
Female
Women 2–3× higher risk. Oestrogen ↑ hepatic cholesterol secretion. Progesterone ↓ gallbladder motility → bile stasis → stone nucleation.
Fat — but paradoxically also Rapid Weight Loss
Obesity: ↑ cholesterol excretion + elevated leptin. Rapid weight loss (bariatric): mobilises cholesterol stores + ↓ GB motility → stone formation. Bariatric patients given prophylactic ursodeoxycholic acid.
Fair (Caucasian / Northern European)
ABCG5/ABCG8 gene variants → ↑ biliary cholesterol secretion. Extremely high prevalence in Native Americans (~70% of Pima Indian women by age 60).
Fertile (pregnant / OCP / multiparity)
Pregnancy: oestrogen ↑ biliary cholesterol + progesterone ↓ GB motility → bile stasis. OCP mimics the hormonal milieu of pregnancy. Risk increases with parity.
Forty (middle age — peak ~40 years)
Average age of symptomatic presentation. Risk accumulates with age and cumulative exposure to risk factors.
Biliary colic: Stone transiently impacts at the neck/Hartmann’s pouch during CCK-mediated GB contraction (fatty meal). Severe constant RUQ/epigastric pain radiating to right shoulder. Self-limiting (stone falls back). No fever, no raised inflammatory markers.
Biliary colic is a symptom, not a disease — transient gallbladder obstruction WITHOUT sustained inflammation. No systemic signs of inflammation (no fever, normal WBC, normal CRP). This is the key distinction from acute cholecystitis.
- Pain: Severe, constant (despite the name, not truly colicky) epigastric or RUQ pain. Radiates to back or right scapula tip. Starts 30–60 minutes after a fatty meal.
- Duration: 30 minutes to 6 hours. If >6 hours → consider acute cholecystitis.
- Associated: Nausea/vomiting. No fever. No jaundice.
- Management: Diclofenac IM (excellent for biliary spasm), anti-emetics, elective laparoscopic cholecystectomy.
How Can a Stone Too Large for the CBD Obstruct the Bowel?
A stone large enough to obstruct the bowel cannot pass through a normal CBD (≤6 mm). It reaches the GI tract via a different route:
Step 1: Recurrent cholecystitis → inflammation → dense adhesions form between the gallbladder and the duodenum.
Step 2: Cholecystoduodenal fistula forms. CT findings: pneumobilia (air in biliary tree — pathognomonic) + loss of fat plane between GB and duodenum.
Step 3: A large stone drops through the wide fistula into the GI tract:
🔵 Bouveret syndrome — stone obstructs the duodenum or pyloric region → gastric outlet obstruction
🔵 Gallstone ileus — stone passes duodenum + jejunum (wider lumen) but impacts at the terminal ileum → SBO.
Rigler’s Triad on AXR: SBO + pneumobilia + ectopic radio-opaque stone (only ~30–35% show all three simultaneously).
Acute Cholecystitis
Acute cholecystitis develops when a gallstone permanently obstructs the gallbladder neck or cystic duct: obstruction → trapped bile irritates the mucosal lining → chemical inflammation (prostaglandin-mediated) → GB wall oedema → secondary bacterial infection (E. coli, Klebsiella, Enterococcus) → mucosal necrosis. Without treatment: empyema → gangrene → perforation.
Acalculous Cholecystitis — The ICU Trap
Cholecystitis without gallstones (~5–10% of cases). Seen in critically ill patients — prolonged fasting (no CCK → bile stasis), major surgery, burns, trauma, TPN, mechanical ventilation. Mechanism: gallbladder ischaemia from splanchnic vasoconstriction + bile stasis + bacterial overgrowth. Higher mortality than calculous cholecystitis because the diagnosis is often delayed. Treat with urgent cholecystostomy or cholecystectomy when safe.
Murphy’s Sign — Technique
Examiner places fingers at the right costal margin in the mid-clavicular line. Patient takes a deep breath — the descending diaphragm moves the inflamed gallbladder onto the examiner’s fingers. A positive Murphy’s sign = patient abruptly halts inspiration due to pain. May be absent in the elderly, diabetics (neuropathy), and opioid-sedated patients.
Investigations
| Investigation | Expected Finding in Cholecystitis | Notes |
|---|---|---|
| WBC / CRP | Both elevated (WBC 12–18 ×10⁹/L typical) | Proportional to severity |
| Bilirubin | NORMAL in uncomplicated cholecystitis | Any elevation = CBD involvement (Mirizzi, choledocholithiasis) — always investigate further |
| ALP / GGT | Mildly elevated (biliary inflammation) | Marked elevation → CBD obstruction |
| ALT / AST | Only mildly elevated | ALT >150 U/L → consider gallstone pancreatitis |
| Amylase | NORMAL | Check to exclude concurrent pancreatitis |
| Troponin / ECG | Normal | MI is an important differential — always check in upper abdominal pain |
| Ultrasound (gold standard) | Echogenic foci with acoustic shadowing (stones), GB wall >3–5 mm, pericholecystic fluid, sonographic Murphy’s sign | First-line. Sensitivity ~90% for stones. ~60–70% for acute cholecystitis. |
| USS stones appearance | Echogenic foci + acoustic shadowing + mobility with patient repositioning | See ultrasound image in gallstones section |
Ultrasound — Gallbladder with Gallstones
The gallstone appears as an echogenic (bright) focus with characteristic posterior acoustic shadowing — the shadow forms because the dense stone blocks sound transmission. Features suggesting cholecystitis: gallbladder wall thickness >3 mm, pericholecystic fluid, non-compressible gallbladder, and a positive sonographic Murphy’s sign (focal tenderness when the probe is pressed directly over the gallbladder).
Initial medical management:
- IV fluids, analgesia (diclofenac IM/rectal, opiates), anti-emetics, nil by mouth
- Broad-spectrum IV antibiotics (Tazocin or co-amoxiclav — cover Gram-negative rods + anaerobes)
Definitive — Early Laparoscopic Cholecystectomy:
- Within 72 hours of symptom onset (“hot lap chole”) — gold standard. Reduces complications, hospital stay.
- If >72 hours: adhesions formed → increased ductal injury risk → delay 6 weeks (interval cholecystectomy)
- Gallstone pancreatitis (mild): same-admission or within 2 weeks
Frail / critically ill / unfit for emergency surgery:
- Emergency cholecystectomy carries prohibitive mortality in organ failure
- Percutaneous cholecystostomy (PTGD) — urgently drain under US/CT guidance
- Tube kept until mature fibrous tract forms (4–6 weeks) — then interval cholecystectomy when optimised
- Some patients: cholecystostomy indefinitely if permanently unfit for surgery
⚠️ Empyema
Gallbladder fills with pus. High fever, rigors, profound sepsis. Urgent cholecystostomy or cholecystectomy. Very high perforation risk.
🚨 Gangrenous Cholecystitis
Full-thickness ischaemia and necrosis of the GB wall. CT: intramural gas or loss of mucosal enhancement. Surgical emergency — perforation imminent.
🚨 Perforation
GB rupture → biliary peritonitis → septic shock. Free perforation = generalised peritonitis. Localised = pericholecystic abscess. Emergency cholecystectomy + washout.
⚠️ Mirizzi Syndrome
Large stone in Hartmann’s pouch or cystic duct compresses the CHD externally → obstructive jaundice. Bilirubin elevated despite no intrinsic CBD stone. Requires HPB specialist — complex reconstruction often needed.
⚠️ Cholecystoenteric Fistula
Recurrent cholecystitis erodes through the GB wall into adjacent bowel (usually duodenum). Silent (pneumobilia on CT) or presents as gallstone ileus / Bouveret syndrome.
⚠️ Gallbladder Carcinoma
Long-standing chronic inflammation significantly increases risk of GB adenocarcinoma. Treat underlying pathology proactively.
Courvoisier’s Law — Palpable Gallbladder + Painless Jaundice
Courvoisier’s Law: A palpable gallbladder in the presence of painless jaundice is unlikely to be caused by gallstones, but is more likely to be caused by malignant obstruction (pancreatic head carcinoma, periampullary carcinoma, cholangiocarcinoma).
Why? In gallstone disease, the gallbladder has been chronically inflamed → fibrosis and scarring of the GB wall → it cannot distend. In malignant obstruction, the gallbladder has a healthy, pliable wall → it can distend to become palpable.
Causes of obstructive jaundice by site: Intrahepatic (PBC, PSC, hepatitis, drug-induced) → CBD (gallstone, stricture, cholangiocarcinoma) → Pancreatic head/periampullary (pancreatic adenocarcinoma, ampullary carcinoma, duodenal carcinoma). Investigation: LFTs + USS + MRCP + CT + ERCP + EUS + CA 19-9.
Ascending Cholangitis & ERCP
Ascending cholangitis is a life-threatening bacterial infection of the biliary tree requiring two co-existing factors: biliary obstruction (most commonly CBD stones, but also strictures, malignancy, biliary stents, post-ERCP) and bacteria in the bile. High intraductal pressure forces infected bile and bacterial endotoxins into the venous and lymphatic systems → rapid systemic sepsis and multi-organ failure if untreated.
Charcot’s Triad
Classic presentation — highly specific but only 50–70% sensitive (many patients, particularly the elderly, don’t have all three):
- Fever / rigors — often dramatic swinging spikes
- RUQ pain
- Jaundice — conjugated hyperbilirubinaemia from CBD obstruction
Reynolds’ Pentad — Severe / Suppurative Cholangitis
Charcot’s triad + altered consciousness + septic shock (hypotension). Indicates pus under pressure in the biliary tree. Immediate biliary decompression is required — this is a surgical emergency.
Organisms
Gram-negative: E. coli (most common), Klebsiella, Pseudomonas, Enterococcus. Ascending from the duodenum via the sphincter of Oddi.
| Investigation | Expected Finding |
|---|---|
| WBC / CRP | Both markedly elevated |
| Bilirubin | Elevated (conjugated) — dark urine, pale stools |
| ALP / GGT | Markedly elevated (obstructive pattern — dominates over ALT) |
| ALT / AST | Mildly elevated (much lower than ALP/GGT) |
| Blood cultures | Positive in ~50%. Guide antibiotic narrowing. |
| Coagulation | May be deranged — fat-soluble vitamin K malabsorption → ↓ clotting factors |
| USS abdomen | Dilated CBD (>7 mm), may show CBD stone (~50% sensitive for CBD stones in retroduodenal segment) |
| MRCP | Gold standard non-invasive CBD stone imaging — sensitivity ~90–95%. Does not allow intervention. Beaded appearance in PSC. |
| EUS | Highly sensitive for small CBD stones. Allows FNA of suspicious lesions. |
Management Principles — Biliary Decompression is the Life-Saving Step
🟢 Resuscitation: IV fluids (aggressive), blood cultures before antibiotics, urine output monitoring
🟢 IV antibiotics: Tazocin (piperacillin-tazobactam) or co-amoxiclav + gentamicin. Cover Gram-negative rods + anaerobes. Narrow based on cultures.
🟢 Urgent biliary decompression:
— ERCP + sphincterotomy + stone extraction — first-line. Within 24–48 hours for moderate/severe, IMMEDIATE for Reynolds’ pentad / suppurative cholangitis.
— Percutaneous Transhepatic Biliary Drainage (PTBD) — if ERCP fails or unavailable (altered anatomy post-Roux-en-Y). IR inserts drain directly into intrahepatic ducts.
— Surgical CBD exploration (CBDE) — rarely needed in the modern era.
🟢 HDU if Reynolds’ pentad
🟢 After recovery: Elective cholecystectomy (for gallstone aetiology) to prevent recurrence.
- 1Side-viewing duodenoscope introduced through the mouth into D2 of the duodenum.
- 2Major duodenal papilla (ampulla of Vater) identified — posteromedial wall of D2, ~7 cm from the pylorus.
- 3Cannulation of the papillary orifice — selective cannulation of the CBD (not the pancreatic duct) is the key technical challenge.
- 4Contrast injection + fluoroscopy — opacifies the biliary tree. Stones = filling defects. Strictures and dilatation also visible.
- 5Sphincterotomy (if needed) — incision of the sphincter of Oddi using an electrosurgical sphincterotome. Irreversible. Widens the papillary orifice.
- 6Stone extraction — Dormia basket (smaller stones) or balloon catheter. Large stones may require mechanical or laser lithotripsy first.
- 7Stenting — plastic or metal SEMS placed across a stricture. SEMS preferred for malignant obstruction (more durable).
- 8Brushings / biopsies — cytological brushings from abnormal bile duct tissue. Useful for cholangiocarcinoma / pancreatic cancer diagnosis.
Post-ERCP Complications
| Complication | Incidence | Key Points & Prevention |
|---|---|---|
| Post-ERCP Pancreatitis (PEP) | 3–5% (most common) | Highest risk: young women, SOD dysfunction, difficult cannulation, pancreatic duct injection. Prevention: rectal indomethacin 100 mg routinely — reduces PEP by ~50%. Some argue young women should have laparoscopic CBD exploration instead. |
| Bleeding | 1–2% | Post-sphincterotomy. Risk: coagulopathy, anticoagulation, portal hypertension. Usually managed endoscopically (adrenaline, clips, diathermy). |
| Perforation | 0.1–0.6% | Retroperitoneal from guidewire or excessive sphincterotomy. CT diagnosis. High mortality if delayed. May require surgery. |
| Cholangitis post-ERCP | 1–3% | Incomplete drainage → infected bile trapped. A septic shower can occur as decompression releases infected bile into the circulation. |
Laparoscopic Cholecystectomy
One of the most commonly performed general surgical operations worldwide. Bile duct injury is its most feared complication — occurring in ~0.3–0.5% but carrying significant morbidity, mortality, and medico-legal consequences.
- Asymptomatic gallstones — reassure, no treatment needed
- Symptomatic gallstones (biliary colic, recurrent) — offer laparoscopic cholecystectomy after shared decision making
- Acute cholecystitis — early lap chole within 72 hours (index admission) preferred over interval
- Gallstone pancreatitis (mild) — same admission or within 2 weeks of discharge
- Previous cholangitis from gallstones — elective after recovery
- NICE recommends as a day case for fit and well patients
| Risk | Key Points for Consent |
|---|---|
| Bleeding | From hepatic vessels, gallbladder fossa, or cystic artery. Usually controlled laparoscopically. Rarely requires conversion to open. |
| Infection | Wound infection, intra-abdominal collection. Operation inherently non-sterile (bile contact). Prophylactic antibiotics at induction reduce risk. |
| Bile leak (~1%) | Risk increased with retained CBD stones (back-pressure on cystic duct clip). May require re-operation for washout + drain ± ERCP. |
| Ductal injury (~0.3–0.5%) | The most serious complication. Range from cystic duct stump leak (type A) to complete CBD transection (type E). Major morbidity/mortality. May require Roux-en-Y hepaticojejunostomy by HPB specialist. |
| Bowel / vessel injury | Port insertion or adhesiolysis. May be missed intraoperatively and present later with peritonitis. |
| Port-site hernia | Avoid heavy lifting for 4 weeks. Close fascial defects >10 mm. |
| Post-cholecystectomy syndrome | Ongoing RUQ pain after cholecystectomy. Causes: retained CBD stone, bile gastritis (bile reflux into stomach), sphincter of Oddi dysfunction. Usually mild and self-limiting. |
| Conversion to open (~3–5%) | Not a failure — a safety decision. More likely in difficult anatomy, previous surgery, severe cholecystitis, suspected ductal injury. |
Strasberg Classification of Bile Duct Injuries
| Type | Description | Management |
|---|---|---|
| A | Cystic duct leak OR leak from small ducts in the liver bed (Ducts of Luschka) | Most common and manageable. ERCP + stent usually curative. |
| B | Occlusion (clipping) of an aberrant right hepatic duct — right lobe slowly infarcts. May be silent for weeks. | Surgical reconstruction by HPB specialist. |
| C | Transection without ligation of an aberrant right hepatic duct — bile leak from the cut end. | Surgical repair + biliary reconstruction. |
| D | Lateral injury to a major bile duct (CBD or CHD) — partial transection. | Primary repair over T-tube or biliary reconstruction. |
| E1–E5 | Circumferential injury to the CHD/CBD at varying levels (E1: >2 cm from confluence; E2: <2 cm; E3: at confluence; E4: with loss of left-right continuity; E5: + aberrant right sectoral duct) | Roux-en-Y hepaticojejunostomy — HPB specialist. E4/E5 are the most catastrophic. |
Laparoscopic Cholecystectomy — Port Setup
T1 (umbilical camera) → T2 (right lateral subcostal grasper) → T3 (right midclavicular left-hand instrument) → T4 (epigastric right-hand instrument). Ensure triangulation between T1, T3, and T4. Patient position: Supine, reverse Trendelenburg (head up) + right side slightly up — gravity moves small bowel inferiorly, exposing the hepatoduodenal ligament. Surgeon stands to the patient’s left.
Introduced by SAGES as the mandatory safety criterion before ANY clipping or division. All three criteria must be met simultaneously:
The Critical View of Safety (CVS) — Intraoperative Appearance
The hepatocystic triangle has been cleared of fat and fibrous tissue. The lower third of the gallbladder has been dissected off the cystic plate, opening the posterior window. Only two structures enter the gallbladder: the cystic duct (inferior) and the cystic artery (superior/posterior). Rouvière’s sulcus (the 2–5 cm fissure between the right lobe and caudate process) is visible — all dissection should remain ABOVE this sulcus. The CBD lies below Rouvière’s sulcus.
The Cardinal Rule — Never Clip Without CVS
Most bile duct injuries occur because the surgeon clips and divides what they believe is the cystic duct — when it is actually the CBD. This happens when:
🔴 CVS not achieved — anatomy assumed rather than confirmed
🔴 CBD tented upward (misidentified as cystic duct) by upward GB retraction
🔴 Parallel or spiral cystic duct present
🔴 Moynihan’s hump of right hepatic artery mistaken for cystic artery
If you cannot safely achieve CVS — stop. Do not cut. Use a bail-out strategy.
Dividing the Cystic Artery — FIRST
2 clips proximally + 1 clip distally. Divided between the clips using laparoscopic scissors. The cystic artery must be divided BEFORE the cystic duct — the delicate artery is susceptible to avulsion once the cystic duct is divided and the gallbladder becomes mobile. Always clip and divide the artery while the gallbladder is still stable.
Dividing the Cystic Duct — SECOND
2 clips proximally (towards CBD) + 1 clip distally (towards gallbladder). Divide between. The proximal clips must lie close to the gallbladder neck, well away from the CBD. Leaving a stump <5 mm reduces stump appendicitis risk. Verify the structure has a lumen before clipping.
Gallbladder Dissection from Liver Bed
Hook diathermy dissection between the gallbladder wall and the cystic plate. Start at the fundus, work toward the neck.
- Too deep (into liver): Significant haemorrhage + bile leakage from Ducts of Luschka (small ducts traversing the cystic plate)
- Too superficial (into GB wall): Perforation → bile spillage + stone drop. Spilled stones MUST be retrieved — cause chronic intra-abdominal abscesses, fistulae, and may require re-operation years later.
The Guiding Principle: “The Best Way to Avoid a Ductal Injury Is to Not Cut Any Ducts”
1. Subtotal Cholecystectomy — remove most of the GB body/fundus, leaving a small cuff of the neck. Avoids dissection in the dangerous hepatocystic triangle. Close the remaining cuff with an endoloop or endoscopic suture. Highly effective — removes the source of stones while protecting the bile ducts.
2. Cholecystostomy + Closure — drain the gallbladder percutaneously and close. Defer definitive surgery. Refer to HPB specialist if anatomy cannot be safely negotiated.
3. Intraoperative Cholangiogram (IOC) — inject contrast through the cystic duct stump to outline the biliary anatomy on fluoroscopy before any division. Identifies aberrant anatomy and confirms CBD continuity. Used routinely in some centres.
4. Conversion to open — improves tactile feedback but does NOT always improve biliary visualisation in a fibrosed field. Not automatically the right answer.
There is no shame in stopping. A patient will always prefer a subtotal cholecystectomy over a CBD injury requiring biliary reconstruction.
Other Conditions of the Gallbladder & Biliary Tree
Polypoid lesions projecting from the gallbladder wall — found incidentally in approximately 5% of all abdominal ultrasounds. The majority are benign (cholesterol polyps most common). However, imaging cannot reliably distinguish benign from malignant, making the management algorithm important.
Classification of Gallbladder Polyps — Histological Types
Gallbladder polyps are classified as true neoplastic polyps (adenomas, carcinomas) vs pseudopolyps (cholesterol polyps — most common, ~60%; adenomyomatous; inflammatory). Cholesterol polyps are benign deposits of cholesterol-laden macrophages — not neoplastic. Adenomas have malignant potential and warrant cholecystectomy. The main challenge: USS cannot reliably distinguish cholesterol polyps from adenomas based on appearance alone.
Management — ESGAR/EAES/ESGE Joint Guidelines
Gallbladder Polyp Management Flowchart (ESGAR/EAES/ESGE Guidelines)
Key decision thresholds: Polyp <5 mm + no risk factors → no follow-up. 5–9 mm no risk factors → USS at 6 months then annually × 5 years. ≥10 mm OR any polyp with high-risk features (age >50, PSC, sessile morphology, rapid growth) → cholecystectomy. Polyp + gallstones + symptoms → cholecystectomy regardless of size.
A chronic benign condition characterised by epithelial proliferation with muscular hypertrophy and the development of intramural diverticulae called Rokitansky-Aschoff sinuses (RAS). These sinuses penetrate through the muscular layer and appear as characteristic “twinkling” artefacts on ultrasound or a “pearl necklace” sign on MRI — pathognomonic, differentiating it from malignancy or cholecystitis. Can cause chronic pain mimicking biliary colic. Treatment: laparoscopic cholecystectomy if symptomatic.
Widespread calcification of the gallbladder wall — visible on plain X-ray or CT. Occurs from chronic inflammation and calcium deposition. Historically believed to carry a high risk of gallbladder carcinoma, but more recent data suggests the association is weaker — the risk is more strongly associated with underlying chronic cholecystitis. Current management: elective cholecystectomy, particularly if symptomatic or if selective (incomplete) calcification pattern.
| Feature | Details |
|---|---|
| Epidemiology | Rare but highly aggressive. ~50% of all biliary tract malignancies. Median 5-year overall survival <10% due to late presentation. |
| Histology | Adenocarcinoma (~90%). Squamous, adenosquamous, and neuroendocrine tumours less common. |
| Risk factors | Gallstones (chronic inflammation — most important), GB polyps ≥10 mm, porcelain gallbladder, PSC, anomalous pancreaticobiliary junction, chronic Salmonella typhi carrier |
| Presentation | Early: mimics biliary colic or cholecystitis. Late: RUQ mass, weight loss, jaundice (invasion of CBD or porta hepatis), Virchow’s node, ascites. |
| Incidental discovery (iGBC) | Found on histology after routine cholecystectomy. T1a (mucosa) → cholecystectomy curative. T1b (muscle) → may be curative. T2+ → re-operation required: hepatic resection (segments IVb + V) + lymphadenectomy by HPB specialist. |
| Operative rule | NEVER perforate the gallbladder if cancer is suspected intraoperatively — peritoneal contamination converts resectable to unresectable disease. Convert to open, retrieve all bile and stones meticulously. |
A chronic, progressive fibro-inflammatory condition affecting both intra- and extrahepatic bile ducts → multifocal biliary strictures → biliary cirrhosis. Strongly associated with UC (present in ~75–80% of PSC patients). No curative medical treatment. Progressive to end-stage liver disease — liver transplantation is the only definitive treatment.
- Investigations: MRCP (“beaded” appearance — alternating dilatations and strictures), liver biopsy (“onion skin” periductal fibrosis)
- Complications: Cholangiocarcinoma (~10–15% lifetime risk), biliary cirrhosis, dominant strictures, cholangitis episodes
- Treatment: Endoscopic dilatation of dominant strictures, liver transplantation for end-stage disease
| Feature | Details |
|---|---|
| Klatskin tumour | Hilar cholangiocarcinoma at the CHD bifurcation — the most common location. Classified by Bismuth-Corlette classification (Types I–IV based on extent of ductal involvement). |
| Types | Intrahepatic vs extrahepatic (perihilar/hilar = Klatskin; distal CBD) |
| Risk factors | PSC, choledochal cysts, Clonorchis sinensis (biliary fluke), hepatolithiasis, biliary papillomatosis, cirrhosis |
| Presentation | Painless obstructive jaundice, pruritus, weight loss, pale stools, dark urine. Cholangitis episodes. |
| Investigation | MRCP + CT (staging) + ERCP (brushings for cytology) + CA 19-9 |
| Treatment | Whipple’s (pancreaticoduodenectomy) for distal CBD tumours. Hepatectomy + bile duct resection + lymphadenectomy for hilar (Klatskin) tumours. Liver transplant in selected PSC-related hilar cases. ERCP + SEMS stenting for palliation. Poor overall prognosis. |
Congenital dilatations of the biliary tree. Todani classification: Type I (most common — fusiform CBD dilatation), Types II–V (various bile duct dilatations). Risk of cholangiocarcinoma — all choledochal cysts should be surgically excised with biliary reconstruction (hepaticojejunostomy) to remove the malignant transformation risk.
Mnemonics & Clinical Pearls
Female
Oestrogen ↑ hepatic cholesterol secretion. Progesterone ↓ gallbladder motility → stasis.
Fat — but paradoxically Rapid Weight Loss too
Obesity: ↑ cholesterol excretion. Rapid weight loss: mobilises cholesterol stores + ↓ GB motility → stone formation. Bariatric patients: prophylactic ursodeoxycholic acid.
Fair (Caucasian / Northern European)
ABCG5/ABCG8 gene variants → ↑ biliary cholesterol. Very high in Native Americans.
Fertile (pregnant, OCP, multiparity)
Oestrogen ↑ biliary cholesterol + progesterone ↓ GB emptying → bile stasis. OCP mimics pregnancy hormonal environment.
Forty (peak age ~40)
Average age of symptomatic presentation. Risk accumulates with age.
Gallbladder → Biliary Colic (transient) or Asymptomatic
No fever, normal WBC/CRP. Pain 30 min to 6 hours. Stone falls back. Manage electively.
Cystic Duct / Neck → Acute Cholecystitis
Permanent obstruction → chemical → bacterial inflammation. Murphy’s sign +ve. Bilirubin NORMAL (unless Mirizzi). Lap chole within 72h.
Common Bile Duct → Obstructive Jaundice / Ascending Cholangitis
Conjugated jaundice + pale stools + dark urine + pruritus. + Infection = Charcot’s triad. Urgent IV antibiotics + ERCP.
Ampulla of Vater → Acute Pancreatitis
Blocks CBD + pancreatic duct. ALT >150 U/L has >85% PPV for gallstone aetiology. Same-admission cholecystectomy after recovery.
Charcot’s Triad — Fever + RUQ Pain + Jaundice
50–70% sensitive. CBD obstruction + bacterial infection. IV antibiotics + urgent ERCP within 24–48 hours.
Reynolds’ Pentad — Charcot’s Triad + Confusion + Hypotension (Septic Shock)
Suppurative cholangitis — pus under pressure. IMMEDIATE ERCP. HDU admission. High mortality without urgent decompression.
Hepatocystic triangle cleared of fat and fibrous tissue
CBD and CHD do NOT need to be exposed. Dissect both anterior and posterior aspects of the triangle.
Lower 1/3 of gallbladder separated from liver (cystic plate visible)
Opens the posterior window. Confirms the structure to be clipped is not the CBD.
Only 2 structures seen entering the gallbladder
If 3 structures are seen — one is the CBD. Stop. IOC or bail-out. Never clip without CVS.
Cholecystitis — ALP/GGT mildly ↑, Bilirubin NORMAL, ALT mildly ↑
No CBD obstruction = no jaundice. Raised bilirubin in cholecystitis = alarm sign → Mirizzi? CBD stone? Gangrene?
Obstructive Jaundice — ALP/GGT markedly ↑↑↑, Bilirubin ↑, ALT only mildly ↑
ALP/GGT >> ALT. Pale stools, dark urine, pruritus. CBD stone → MRCP → ERCP. Pancreatic head mass → triple-phase CT.
ALT >150 U/L in pancreatitis → >85% chance of gallstone aetiology
Always check ALT in acute pancreatitis. If significantly elevated → gallstones are the most likely cause → USS + plan cholecystectomy.
SBO + Pneumobilia + Ectopic Radio-opaque Stone = Gallstone Ileus
Pneumobilia (air in biliary tree) = pathognomonic of cholecystoenteric fistula. Stone impacts at terminal ileum (narrowest lumen). Only ~30–35% show all three features simultaneously. CT is diagnostic.
Palpable GB + painless jaundice = likely malignant obstruction (NOT gallstones)
Gallstone disease → chronic cholecystitis → fibrosed GB wall → cannot distend. Malignant obstruction → healthy, pliable GB wall → distends and becomes palpable. Think pancreatic head carcinoma, periampullary carcinoma, cholangiocarcinoma.