Almost everything written about choledochal cysts is written about children. That is understandable — the condition is congenital, and most cases are found young. But it leaves a large group with nothing written for them: adults told, sometimes in their fifties, that the pain they have had for years is a bile duct malformation they were born with.
This page is general information, not medical advice. Please discuss your own case with a specialist team.
Far more often than most resources suggest. StatPearls states that while most are diagnosed in childhood, around 25% of cases are discovered in adults; adult radiology reviews give a similar figure of roughly 20%. The condition is rare — about 1 in 100,000 to 150,000 live births in Western populations, against 1 in 1,000 in parts of Asia, and affecting women around four times as often as men. That rarity is part of the problem: a general surgeon may see one case in a career.
Adult diagnosis also appears to be rising, and the reason is not that more cysts are forming but that more people are being scanned. A British Journal of Surgery review noted an increasing reported occurrence in adults, which imaging reviews link to widespread cross-sectional imaging: CT and MRI ordered for back pain or trauma now find biliary dilatation nobody was looking for. If you were diagnosed incidentally, you are not alone.
The textbook “classic triad” — pain, jaundice and a lump beneath the right ribs — describes a small child. It appears in only about 20% of cases overall, and is rarer still in adults: in a series of 329 operated patients in Updates in Surgery, the full triad was present in 9% of children but only 2.4% of adults, and a palpable lump in 10.3% of children versus 3.2% of adults.
What adults get instead is pain. A multi-institutional analysis of 394 patients found abdominal pain in 71.8% of adults versus 40.7% of children, while jaundice ran the other way — 31.9% of children versus 11.6% of adults. A 2026 Surgical Endoscopy series of 100 adults with type I cysts, median age 41, describes the adult picture precisely: biliary colic or right upper quadrant pain in 62%, pancreatitis in 16%, cholangitis in 11%, weight loss in 6%.
Adults also arrive with more damage already done. In the 329-patient series, gallstones were present in 36.7% of adults versus 3.8% of children, stones within the cyst itself in 56.6% versus 38.5%, and stones inside the liver in 7.6% versus 1.3%. Cyst type differs too: type I is most common overall at around 71%, but type IV cysts, which involve ducts inside the liver, are far more frequent in adults — 23.9% versus 12.0%. Our page on the Todani classification covers all five, including type V (Caroli disease).
The upshot is that the adult version of this condition looks like a great many commoner things — see our symptoms page for the full range.
This is what adults tell us about most, and the numbers bear it out. In that 329-patient series, 32.7% of adults had already had previous biliary surgery before the cyst was addressed — usually gallbladder removal, performed before anyone established what was actually wrong. The pattern is familiar:
The single most useful question you can ask is: “Has an MRCP been done?” Magnetic resonance cholangiopancreatography is a non-invasive MRI of the biliary tree, and it is the test that answers the question. Its reported sensitivity is 90% to 100%, and it has effectively replaced diagnostic ERCP here. Ultrasound — what most people get first — fails to establish the underlying cause in about one in three patients. “Dilated bile duct” on an ultrasound is a reason to do an MRCP, not a diagnosis. Our diagnosis page explains what each test can and cannot show.
The largest analysis is the British Journal of Surgery meta-analysis by ten Hove and colleagues, pooling 18 studies and 2,904 patients:
For adults, the 7.3% figure is the important one. That risk does not begin at diagnosis — it accumulates across every year the cyst goes unrecognised. An adult diagnosed at 45 has had four decades of pancreatic juice refluxing into the bile duct; a child operated on at three has had none.
It is worth being accurate in the other direction too. The 2026 Surgical Endoscopy adult series found cholangiocarcinoma in 6% over a median 7.7 years, and concluded the risk in adults diagnosed later may be lower than older figures suggested. Tellingly, five of its six malignant cysts had been diagnosed in childhood but never properly resected — only drained or bypassed, averaging 21.5 years between that inadequate operation and the cancer. Our complications page covers the non-cancer risks.
The operation is the same in principle at any age: complete excision of the affected extrahepatic bile duct with the gallbladder, and reconstruction by Roux-en-Y hepaticojejunostomy. Drainage or bypass is no longer acceptable for types I and IV, because it leaves the cancer risk behind. Our treatments page explains the procedure in full.
In adults it is technically harder: years of inflammation fuse the tissue planes; liver fibrosis may have developed; previous surgery leaves adhesions; the cyst may be large and stuck to the portal vein and hepatic artery; and stones inside the liver may need dealing with at the same time. Adults do well, but less easily than children:
Open, laparoscopic or robotic? All three are used in adults. A review of minimally invasive adult surgery reported shorter stay (5 versus 7 days) and less blood loss than open, but longer operating times and similar complication rates. A 2025 multicentre European study of robotic excision in 22 adults found it feasible and safe — 27% morbidity, 14% bile leak, 9% reoperation — while calling for longer follow-up before claiming superiority. The surgeon’s experience matters more than the platform. See preparing for surgery and what recovery looks like.
Excision reduces the cancer risk substantially but does not abolish it — 3.4% of patients in the meta-analysis developed malignancy after treatment, and strictures, stones and cholangitis can appear decades later. Follow-up is lifelong: liver blood tests, tumour markers and periodic imaging.
There is a specific failure adults should know about. People operated on as children are often discharged from paediatric services in their teens with no adult clinic to move to, and resurface decades later with a stricture, intrahepatic stones, recurrent cholangitis or a cancer — exactly the pattern in that adult series. If nobody follows you up now, ask your GP to refer you to an adult HPB or hepatology service. Our current research page tracks the evolving surveillance evidence.
We will be straight with you: the evidence here is case reports and nothing stronger. A 2023 systematic review in the World Journal of Gastrointestinal Surgery gathered every published case it could find — 97 cases across 71 publications, spanning 1932 to 2020. Complications described included cholangitis and, rarely, cyst rupture. The authors were explicit that data were missing throughout, that treatment standards changed enormously across those decades, and that no comparative analysis was possible.
Practically: nobody can give you a reliable percentage risk for pregnancy with an unresected cyst, and you should be sceptical of any site that offers one. Most specialists advise excision before a planned pregnancy where possible, and joint HPB and obstetric care where a cyst is found during one.
Adults often end up under a general surgeon simply because that is where the referral went. That is worth challenging. You want a hepato-pancreato-biliary (HPB) surgeon at a centre performing complex biliary reconstruction regularly — bile duct surgery is unforgiving, and reoperation after a leak or stricture is far worse than getting the first operation right. Our find a doctor page lists specialist centres. Before your appointment, gather:
Questions worth asking the surgeon:
A second opinion is normal, particularly if you are offered anything short of complete excision, and no good HPB surgeon will be offended. Our FAQ answers the smaller practical questions, and community and support options are listed separately.
The first few days are usually relief and fear together — relief that something real has finally been named, fear at what you are reading about cancer. Both are reasonable. But you have not missed your chance: those malignancy figures describe populations, not you, and the great majority of adults who are diagnosed and properly treated do not develop cancer. The years of not being believed were not your fault. The most useful thing you can do now is get to an HPB centre with your records and your questions.
If you would like to share your experience so that the next adult searching at two in the morning finds something written for them, our stories page and contact page are open.