Gallstones in the Bile Duct: Symptoms, Jaundice, ERCP and Surgery

Gallstones in the bile duct, known medically as choledocholithiasis, are gallstones that have moved out of the gallbladder into the main bile duct, where they can block the flow of bile from the liver to the intestine. This makes them more serious than a stone sitting quietly in the gallbladder, because a blocked duct can cause jaundice, an infected duct, or inflammation of the pancreas¹.

When a scan first found my gallbladder full of stones, the thing the surgeon checked next was whether any had slipped into the duct, and it was the first time anyone had explained to me that the same stones behave very differently depending on where they end up. This is the plain account I wanted then, of what a stone in the main duct does, how it is found and cleared, and why the gallbladder still comes out afterwards. What the stones are and why they form is covered in gallstones explained.

What are gallstones in the bile duct?

A bile-duct stone is a gallstone that has left the gallbladder and lodged in the common bile duct, the tube carrying bile from the liver down to the small intestine. Most stones form in the gallbladder and stay there, but a small one can pass through the cystic duct and into the main channel, where it may sit harmlessly or block the flow². Around 10 to 15% of adults in Western populations have gallstones at all, more often women, and only a minority of those ever develop a stone in the duct².

The distinction matters because the gallbladder is a storage pouch off to the side, while the bile duct is the main drain. A stone in the pouch causes attacks; a stone in the drain can back bile up towards the liver and the pancreas, which is why the two are treated with different urgency.

Symptoms: jaundice, dark urine and pain

The tell-tale sign of a bile-duct stone is jaundice: a yellow tint to the skin and the whites of the eyes, usually with dark urine and pale, putty-coloured stools, on top of the gripping upper-right pain of a gallstone attack. These colour changes happen because blocked bile cannot drain, so its pigment builds up in the blood instead¹. Some people also notice itching.

The pain itself is the same severe, gripping ache high under the right ribs that defines a gallbladder attack, often after a fatty meal and lasting from minutes to a few hours. The difference is the added jaundice, and it is the yellowing rather than the pain that tends to send people to hospital.

Why a duct stone is more serious

A stone in the main duct is more dangerous than one in the gallbladder because a blocked duct can become infected (cholangitis) or set off gallstone pancreatitis, both of which can be serious. People with symptomatic gallstones already carry roughly a 1 to 4% per year risk of a complication such as a blocked duct or inflammation, and a stone that reaches the main duct is that complication happening³.

Cholangitis, an infected obstructed duct, classically brings jaundice together with fever and shivering, and it needs urgent treatment rather than watchful waiting. Pancreatitis follows when a stone blocks the shared opening where the bile and pancreatic ducts drain. This is why a stone in the duct is not something to sit on, and why the decision about surgery, set out in do I need my gallbladder removed, tends to be made quickly once a duct stone is confirmed.

How bile-duct stones are found

Bile-duct stones are usually picked up through a combination of blood tests showing a blocked, backed-up liver picture and a scan of the ducts, since a small stone in the duct is often missed on a standard ultrasound. Raised bilirubin and liver readings on a blood test point to obstruction, and a specialised scan then looks for the stone itself³.

An ordinary abdominal ultrasound sees the gallbladder well but often cannot see far enough down the duct, so an MRI scan of the ducts (an MRCP) or an ultrasound taken from inside the gut is used when a duct stone is suspected. NICE advises this kind of duct imaging when the blood tests or scans raise the question, before deciding how to clear it³. When my own ducts were checked, it was a relief to be told they were clear, and to understand that a raised reading on a blood test was the thing that would have changed the plan.

ERCP: clearing the duct

A blocked bile duct is most often cleared with ERCP, an endoscopic procedure in which a flexible camera is passed through the mouth and stomach to the duct opening, and the stone is removed without any cut to the abdomen. Dye is injected to show the ducts on X-ray, the small muscular opening is usually widened, and the stone is pulled out or a temporary stent is placed to keep bile draining³.

ERCP is done under sedation or a general anaesthetic and is a targeted way to deal with a stone in the drain, separate from the operation that removes the gallbladder. It is not without its own risks, including a bout of pancreatitis, which is why it is used for the duct stone specifically rather than as routine. NICE recommends clearing the duct and removing the gallbladder for people with duct stones, whether in one procedure or two³.

Where surgery fits

Once the duct is cleared, the gallbladder is normally removed as well, because clearing the duct deals only with the stone that escaped while the gallbladder full of stones remains, ready to send another one down. Removal is done as a cholecystectomy, usually keyhole and often during the same hospital admission, under a general anaesthetic⁴.

Sometimes the order is reversed and the duct is cleared during the gallbladder operation itself: the surgeon takes an X-ray of the ducts on the table (an intraoperative cholangiogram) and, if a stone is found, explores and clears the duct or arranges an ERCP to follow⁵. Either way the aim is the same, to empty both the duct and the pouch so the whole problem is dealt with rather than half of it.

Can duct stones come back after removal?

Stones can still form in the bile duct in a small number of people even after the gallbladder is gone, which is a separate problem from gallbladder stones and worth knowing about. Removing the gallbladder prevents the great majority of new stones, since that is where most of them form, but the duct can occasionally make its own, and a stone can rarely be left behind at the first operation².

The practical point is that new jaundice, dark urine or duct-type pain after gallbladder surgery should always be checked rather than assumed to be nothing, because it can mean a duct stone that a later ERCP can clear. For most people, though, life without a gallbladder settles quickly and the duct never troubles them again.