Common bile duct stones and cholangitis
Stones that leave the gallbladder and lodge in the common bile duct cause a different and more serious set of problems than stones confined to the gallbladder. They obstruct the flow of bile, producing jaundice, and they may precipitate two dangerous complications: cholangitis, which is infection of the obstructed bile duct, and gallstone pancreatitis. Cholangitis in particular is a medical emergency.
How it forms
The common bile duct carries bile from the liver and gallbladder to the duodenum. Most duct stones originate in the gallbladder and migrate down the cystic duct into the common duct — these are called secondary stones and are by far the commonest type.
Primary stones form within the duct itself. They arise where bile is stagnant or infected, typically behind a stricture, in a dilated duct, or in association with chronic biliary infection, and they are usually soft brown pigment stones rather than the hard cholesterol stones of the gallbladder.
A stone obstructing the duct raises pressure in the biliary system. Bile cannot drain, so conjugated bilirubin refluxes into the bloodstream and the patient becomes jaundiced; the urine darkens as bilirubin is excreted by the kidneys, and the stools become pale because bile pigment no longer reaches the bowel.
Cholangitis follows when that obstructed, stagnant bile becomes infected. Raised pressure within the duct forces bacteria and their toxins across into the bloodstream — cholangiovenous reflux — which is why cholangitis produces systemic sepsis so rapidly. This mechanism explains the central principle of treatment: antibiotics alone cannot control cholangitis, because until the pressure is relieved the infection continues to be pumped into the circulation. Drainage is the treatment.
Symptoms
Bile duct stone without infection
- jaundice — yellow eyes and skin
- dark urine and pale stools
- itching
- upper abdominal pain, often colicky
- sometimes no symptoms at all, the stone being found on imaging
Cholangitis
The classical Charcot triad is pain, fever and jaundice. Where the illness progresses to septic shock, the Reynolds pentad adds confusion and low blood pressure — a sign of severe, life-threatening disease requiring immediate drainage.
Older patients may present atypically, with confusion or collapse and without the full triad, which is a recognised trap.
How the diagnosis is made
Liver function tests show an obstructive pattern — raised bilirubin, alkaline phosphatase and gamma-GT. Inflammatory markers rise in cholangitis, and blood cultures are taken before antibiotics.
Ultrasound shows gallstones and a dilated bile duct, but it detects stones within the duct itself in only around half of cases, because gas in the duodenum obscures the lower duct. A normal ultrasound does not exclude a duct stone, which is a frequent source of false reassurance.
MRCP is the non-invasive test of choice and is highly accurate. Endoscopic ultrasound is equally accurate and is particularly useful for small stones and sludge. ERCP is now used principally as a treatment rather than a diagnostic test, because it carries risks that a purely diagnostic procedure should not.
Patients are stratified by probability of a duct stone — high, intermediate or low — based on bilirubin level, duct diameter, and whether a stone has been seen. That stratification determines whether to proceed directly to ERCP, to investigate further with MRCP or endoscopic ultrasound, or to proceed to cholecystectomy with intraoperative assessment of the duct.
Treatment
Cholangitis — urgent biliary drainage
Resuscitation, intravenous antibiotics and urgent decompression of the duct. ERCP with sphincterotomy and stone extraction, or stent placement where stones cannot be cleared immediately, is the standard approach and should be performed early — within 24 hours in severe cases. Where ERCP is not possible, percutaneous transhepatic drainage or surgical drainage are the alternatives. Timeliness of drainage is the factor most strongly associated with outcome.
Duct stones without cholangitis
- ERCP with sphincterotomy and stone extraction — the commonest approach. The sphincter at the ampulla is divided endoscopically and stones are retrieved with a balloon or basket. Large stones may require mechanical lithotripsy or a temporary stent with repeat procedure.
- Laparoscopic bile duct exploration — clearing the duct at the same time as removing the gallbladder, either through the cystic duct or by opening the duct directly. This single-stage approach avoids a separate endoscopic procedure and is appropriate where the expertise is available.
- Open exploration — now uncommon, reserved for difficult stones or where other approaches have failed.
Removing the gallbladder
Once the duct is cleared, cholecystectomy is strongly recommended, ideally during the same admission or soon after. Leaving the gallbladder in place after a duct stone leaves a substantial risk of further stones migrating, with a further episode of cholangitis or pancreatitis. This is a common and avoidable failure of follow-through: the acute problem is fixed endoscopically and the definitive operation never happens.
Recovery
After uncomplicated ERCP, patients are observed for a few hours to overnight, the main risks being post-ERCP pancreatitis, bleeding and, rarely, perforation. After cholangitis, recovery depends on how unwell the patient became; those who required intensive care recover over weeks. Laparoscopic cholecystectomy with duct exploration involves a slightly longer stay than cholecystectomy alone.
Follow-up
Liver function tests are rechecked to confirm resolution. Where a stent was placed it must be removed or exchanged — a forgotten biliary stent causes obstruction and infection months later, and this happens more often than it should. Patients with primary duct stones are assessed for an underlying cause such as a stricture or duct abnormality.
Common questions
Why am I jaundiced if my gallstones were only in the gallbladder?
Because a stone can move. Stones frequently escape the gallbladder into the bile duct, where they block the flow of bile and cause yellowing of the eyes and skin, dark urine and pale stools.
Is jaundice from a gallstone dangerous?
It needs prompt treatment. On its own it is not immediately dangerous, but obstructed bile readily becomes infected, and that infection — cholangitis — can become life-threatening within hours. Jaundice with fever or shivering attacks requires emergency assessment.
What is ERCP and will it hurt?
ERCP is an endoscopic procedure performed under sedation or anaesthetic, in which a camera is passed through the mouth to the duodenum, the opening of the bile duct is widened, and stones are removed. You will not feel it at the time. Mild throat discomfort and bloating afterwards are usual.
Do I still need my gallbladder removed if the stone has been taken out of the duct?
In nearly all cases, yes. The duct stone came from the gallbladder, and leaving the gallbladder in place means further stones can migrate and cause another blockage, infection or pancreatitis. The operation is normally recommended soon after the duct has been cleared.
Can a scan miss a stone in the bile duct?
Yes. Ordinary ultrasound detects stones within the bile duct in only about half of cases, because bowel gas obscures the lower part of the duct. If a duct stone is suspected despite a normal ultrasound, an MRCP scan or endoscopic ultrasound is used.
What does it mean if I have a stent in my bile duct?
A stent is a small tube that holds the duct open so bile can drain. Most are temporary and must be removed or replaced at a planned date. It is important not to miss that appointment, as a stent left indefinitely can block and cause infection.
Related conditions
Other conditions of the gallbladder & bile ducts covered on this site:
- Gallstones and biliary colic
- Acute cholecystitis
- Gallbladder polyps
- Obstructive jaundice
- Gallbladder cancer
- Cholangiocarcinoma (bile duct cancer)
- Bile duct strictures, cysts and benign tumours
- Bile duct injury after gallbladder surgery
This page provides general information and does not replace an individual medical consultation. Assessment and treatment are decided for each patient after review of their history, examination and investigations.