Common Bile Duct Stones (Choledocholithiasis)
Diagnosis and Treatment of Bile Duct Stones Causing Jaundice
Overview
Common bile duct (CBD) stones — medically termed choledocholithiasis — occur when gallstones migrate from the gallbladder into the common bile duct, the tube that carries bile from the liver and gallbladder to the small intestine. Unlike gallstones confined to the gallbladder, CBD stones can obstruct bile flow, causing jaundice, and may lead to life-threatening complications including acute cholangitis (infected bile duct) and gallstone pancreatitis.
CBD stones are found in approximately 10–15% of patients with symptomatic gallstone disease. The incidence increases with age — CBD stones are found in up to 25% of patients over 60 years undergoing cholecystectomy. In India, the high prevalence of gallstone disease means that CBD stones represent a significant proportion of emergency surgical admissions, particularly in older patients.
Types
Secondary CBD Stones
85–90% of CBD stonesThe most common type — stones that originate in the gallbladder and migrate into the CBD through the cystic duct. These are typically cholesterol or mixed stones and are found in patients with known gallbladder stones.
Primary CBD Stones
10–15% of CBD stonesStones that form de novo within the bile duct itself, typically brown pigment stones associated with biliary stasis, infection, or anatomical abnormalities of the bile duct. More common in Asian populations and in patients with biliary strictures or previous biliary surgery.
Causes & Risk Factors
Migration from Gallbladder
The most common mechanism. Gallstones pass through the cystic duct into the CBD. Small stones (<5 mm) are most likely to migrate. Once in the CBD, they may pass spontaneously into the duodenum or become impacted at the ampulla of Vater.
Biliary Stasis
Conditions that impair bile flow — biliary strictures, previous biliary surgery, choledochal cysts, or papillary stenosis — allow bile to stagnate, promoting stone formation within the duct itself.
Biliary Infection
Bacterial infections of the bile duct (particularly with E. coli, Klebsiella, and Bacteroides) produce beta-glucuronidase, which deconjugates bilirubin, leading to brown pigment stone formation. Common in Southeast Asia where biliary parasites (Clonorchis sinensis, Ascaris) are prevalent.
Haemolytic Conditions
Conditions causing excessive red blood cell breakdown (sickle cell disease, thalassemia, hereditary spherocytosis) flood the bile with bilirubin, predisposing to pigment stone formation in both the gallbladder and bile ducts.
Signs & Symptoms
Biliary Colic
Sudden, severe upper right abdominal or epigastric pain, often radiating to the right shoulder or back. Caused by a stone temporarily impacting the ampulla of Vater and obstructing bile flow. Pain may resolve if the stone passes spontaneously.
Jaundice
Yellow discolouration of the skin and sclerae (whites of the eyes) caused by bilirubin accumulation when bile flow is obstructed. Jaundice from CBD stones is typically fluctuating — it may come and go as the stone shifts position. Painless, progressive jaundice is more suggestive of malignancy.
Dark Urine
Tea-coloured or cola-coloured urine caused by bilirubin being excreted by the kidneys when it cannot flow through the obstructed bile duct. Always accompanies jaundice from bile duct obstruction.
Pale Stools
Clay-coloured or acholic stools result from the absence of bile pigments (stercobilin) in the faeces when bile flow is obstructed. A reliable indicator of bile duct obstruction.
Fever and Rigors (Cholangitis)
Charcot's triad — right upper quadrant pain, fever with rigors, and jaundice — is the classic presentation of acute cholangitis (infected bile duct). This is a medical emergency requiring immediate hospitalisation, IV antibiotics, and urgent ERCP.
Epigastric Pain Radiating to the Back (Pancreatitis)
When a CBD stone impacts at the ampulla of Vater and obstructs the pancreatic duct, it causes acute pancreatitis — severe epigastric pain radiating to the back, nausea, vomiting, and elevated serum amylase/lipase.
Diagnosis
Liver Function Tests (LFT)
Elevated in 70% of CBD stone casesElevated serum bilirubin (both direct and total), ALP, and GGT suggest bile duct obstruction. ALT/AST may be transiently elevated. Normal LFTs do not exclude CBD stones — up to 30% of patients with CBD stones have normal LFTs.
Ultrasound Abdomen
50–75% for CBD stonesFirst-line imaging. Can detect CBD dilatation (>8 mm is abnormal) suggesting obstruction, and may directly visualise stones in the duct. However, the distal CBD (near the ampulla) is often obscured by bowel gas, limiting sensitivity for stones in this region.
MRCP (MR Cholangiopancreatography)
90–95% sensitivityThe gold-standard non-invasive investigation for CBD stones. Provides detailed images of the entire biliary tree without radiation or contrast. Sensitivity exceeds 90% for stones >5 mm. The investigation of choice when CBD stones are suspected but not confirmed on ultrasound.
Endoscopic Ultrasound (EUS)
>95% sensitivity including small stonesHighly sensitive for small CBD stones (<5 mm) that may be missed on MRCP. Performed by inserting an ultrasound probe into the duodenum via endoscopy. Can be followed immediately by ERCP if stones are confirmed, avoiding a separate procedure.
ERCP (Diagnostic and Therapeutic)
Near 100% sensitivity; also therapeuticThe most sensitive investigation for CBD stones, but also the most invasive. ERCP is both diagnostic (cholangiogram) and therapeutic (stone removal). Reserved for patients with high clinical probability of CBD stones where treatment is planned.
Serum Amylase and Lipase
Diagnostic for pancreatitis complicationElevated in gallstone pancreatitis. Amylase >3x upper limit of normal is diagnostic of pancreatitis. Lipase is more sensitive and specific than amylase. Used to assess for this complication of CBD stones.
Potential Complications
If left untreated, gallstone disease can progress to the following complications:
- Acute cholangitis — bacterial infection of the obstructed bile duct. Ranges from mild (responds to antibiotics and ERCP) to severe (Reynolds' pentad: pain, fever, jaundice, hypotension, confusion) — a life-threatening emergency with mortality up to 10–30% if not treated promptly.
- Gallstone pancreatitis — stone impaction at the ampulla obstructs the pancreatic duct. Severity ranges from mild oedematous pancreatitis (resolves with fasting and IV fluids) to severe necrotising pancreatitis with multi-organ failure and mortality up to 30%.
- Secondary biliary cirrhosis — prolonged bile duct obstruction damages liver cells, eventually causing cirrhosis. Rare in the modern era of prompt diagnosis and treatment.
- Biliary stricture — recurrent inflammation from stone passage can cause scarring and narrowing of the bile duct, predisposing to future stone formation and obstruction.
- Liver abscess — rare complication of severe cholangitis where infection spreads into the liver parenchyma.
Treatment Options
ERCP with Sphincterotomy and Stone Extraction
The gold-standard treatment for CBD stones. A duodenoscope is passed through the mouth to the bile duct opening. A sphincterotomy (small cut) widens the opening, and stones are extracted using a balloon or basket. Success rate >90% in experienced hands.
Suitable for: First-line treatment for all CBD stones
Biliary Stent Placement
When stones cannot be fully cleared at ERCP (very large stones, multiple stones, patient too unwell for prolonged procedure), a plastic or metal stent is placed to relieve obstruction. Definitive stone clearance is planned as a second procedure.
Suitable for: Temporary measure when complete stone clearance is not possible
Mechanical Lithotripsy
Large stones (>15 mm) that cannot be extracted intact are fragmented using a mechanical lithotripter — a wire basket that crushes the stone. Allows extraction of fragments that would otherwise be too large to pass through the sphincterotomy.
Suitable for: Large CBD stones >15 mm
Laparoscopic CBD Exploration
In centres with appropriate expertise, CBD stones can be removed laparoscopically at the same time as cholecystectomy, avoiding the need for ERCP. Requires specialised training and equipment. Increasingly performed in high-volume centres.
Suitable for: Intraoperatively discovered CBD stones during cholecystectomy
Subsequent Laparoscopic Cholecystectomy
After successful ERCP and CBD clearance, laparoscopic cholecystectomy is strongly recommended within 2–6 weeks to remove the gallbladder and prevent recurrence of CBD stones. Without cholecystectomy, CBD stone recurrence rate is 10–15% per year.
Suitable for: All patients after ERCP, unless unfit for surgery
Prevention
- Treat gallbladder stones before they migrate to the CBD — early cholecystectomy for symptomatic gallstones
- Avoid prolonged fasting and total parenteral nutrition which promote biliary stasis
- Maintain a healthy weight to reduce cholesterol stone formation
- Manage haemolytic conditions with appropriate medical therapy
- Regular follow-up after ERCP to monitor for recurrence
- Cholecystectomy after ERCP to eliminate the source of future CBD stones
When to Seek Immediate Medical Help
- Jaundice (yellow skin or eyes) — always requires urgent evaluation
- Fever with abdominal pain and jaundice (Charcot's triad) — medical emergency
- Severe epigastric pain radiating to the back with nausea — may indicate pancreatitis
- Dark urine and pale stools persisting more than 24 hours
- Confusion, low blood pressure, or rapid heart rate with fever and jaundice — severe cholangitis emergency
- Worsening pain after a previous episode of biliary colic
Prognosis & Outlook
With prompt diagnosis and treatment, the prognosis for CBD stones is excellent. ERCP successfully clears stones in over 90% of cases, and symptoms resolve rapidly after bile duct decompression. The key to good outcomes is timely treatment — delayed management of cholangitis or gallstone pancreatitis significantly worsens prognosis. After successful ERCP and subsequent cholecystectomy, the long-term prognosis is the same as for uncomplicated gallstone disease.
Frequently Asked Questions
How do I know if I have CBD stones vs. gallbladder stones?
CBD stones typically cause jaundice (yellow skin/eyes), dark urine, and pale stools — symptoms not caused by gallbladder stones alone. Elevated bilirubin and ALP on blood tests, and bile duct dilatation on ultrasound, are the key indicators. MRCP or EUS confirms the diagnosis.
Can CBD stones pass on their own?
Small CBD stones (<5 mm) may pass spontaneously into the duodenum. However, this cannot be predicted reliably, and waiting for spontaneous passage risks cholangitis or pancreatitis. Most symptomatic CBD stones require ERCP for safe removal.
Is ERCP the only treatment for CBD stones?
ERCP is the gold-standard treatment, but laparoscopic CBD exploration (at the time of cholecystectomy) is an alternative in experienced hands. Open surgical CBD exploration is rarely needed in the modern era. For patients unfit for ERCP, biliary stenting provides temporary relief.
What is the risk of cholangitis if CBD stones are left untreated?
Untreated CBD stones carry a significant risk of cholangitis — estimated at 20–30% over 5 years. Cholangitis can be life-threatening, with mortality up to 10–30% in severe cases. This is why prompt treatment of CBD stones is strongly recommended even in minimally symptomatic patients.
MS (General Surgery) · Fellowship in Advanced Laparoscopy & Bariatric Surgery (Belgium) · Consultant Surgeon, Apollo Clinic Indiranagar
Last reviewed: April 2026 · View credentials
This content has been reviewed for medical accuracy by a qualified consultant surgeon with over 12 years of experience in advanced laparoscopic and robotic surgery. It is intended for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment.