Medical Oncologist
CION Cancer Clinics
Bile duct cancer inside the liver and outside it: what is different | CION Cancer Clinics
Bile duct cancer inside the liver usually grows as a lump and is found late, often by chance on a scan. Bile duct cancer outside the liver usually blocks bile early and shows up as jaundice. Both are cholangiocarcinoma, and the medicines are mostly shared. What differs is how it is found, how a sample is taken, the kind of operation possible and how often a gene change turns up. At CION Cancer Clinics in Hyderabad, our oncologists explain liver cancer in plain words and plan care around you and your family.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- What is the difference between bile duct cancer inside and outside the liver?
- How do the two types compare, point by point?
- Does it change how the cancer is treated?
- What should I ask the doctor about the location?
- What do families often get wrong about bile duct cancer?
- What this page cannot tell you
- Common questions about where bile duct cancer starts
The short answer
What is the difference between bile duct cancer inside and outside the liver?
Both are cholangiocarcinoma, a cancer that starts in the cells lining the bile ducts. The difference is where along the ducts it starts. Inside the liver, it usually grows as a lump and is found late. Outside the liver, it usually blocks the flow of bile early and shows up as jaundice.
The bile ducts are a branching tree
Bile is a digestive juice made by the liver. Tiny ducts collect it inside the liver and join into bigger ones, like twigs joining branches. Two main ducts leave the liver, join at a point called the hilum, and run down as one tube past the pancreas into the gut. Cancer can start anywhere on that tree.
Doctors split it into three places
Intrahepatic means inside the liver, in the smaller branches. Perihilar means at or near the hilum, just where the ducts leave the liver. Distal means lower down, close to the pancreas. Perihilar and distal together are called extrahepatic, meaning outside the liver.
This page is about cancer that started in the bile ducts. If your report says the liver has spread from cancer somewhere else, read primary and secondary liver cancer first. Gallbladder cancer is a separate illness with its own section of the site.
Side by side
How do the two types compare, point by point?
Inside the liver (intrahepatic)
Outside the liver (perihilar or distal)
Usually a mass found on a scan, sometimes by chance
Usually a narrowing of the duct, found because of jaundice
Early signs are vague: tiredness, weight loss, a dull ache
Yellow eyes, dark urine, pale stools and itching often come first
Biopsy is usually a needle through the skin into the lump
Tissue is usually taken through an endoscope inside the duct, and can be hard to get
A stent is rarely needed at the start
A stent or drain often comes before any cancer treatment
Surgery, where possible, removes part of the liver
Perihilar surgery removes duct and liver; distal surgery is usually a Whipple's operation
Gene changes with a matching medicine are found more often
Gene changes are found less often, but testing is still worth doing
Why the location matters
Does it change how the cancer is treated?
The medicines are mostly shared. What changes is how it is found, how tissue is taken, and what kind of operation is possible.
Intrahepatic: often a liver operation
If the tumour can be removed and enough healthy liver will remain, the surgeon removes the part of the liver that holds it, along with nearby lymph nodes. This is a liver resection. Because the cancer is often found when it is already large, many people are not suitable for surgery at diagnosis.
Perihilar: the hardest place to operate
The hilum sits right beside the main blood vessels of the liver. Removing a tumour here usually means removing the bile ducts and a large part of the liver together, then reconnecting the ducts to the bowel. It is major surgery done in specialist centres.
Read more on perihilar cholangiocarcinoma.Distal: an operation shared with the pancreas
A tumour low in the duct is usually removed with a Whipple's operation, which takes out the head of the pancreas, the lower bile duct and part of the small bowel. The liver itself is left alone.
When surgery is not possible
For all three, the main treatment is then medicine through a drip: chemotherapy, often with an immunotherapy drug added. Jaundice must be relieved first, which is why a stent often comes before anything else in the outside-the-liver types.
Not sure whether this applies to you?
Ask an oncologistAt the clinic
What should I ask the doctor about the location?
- Is the tumour inside the liver, at the hilum, or lower down the duct?
- Has a sample been taken, and was it enough to confirm the type?
- Has the tumour been tested for gene changes, and on which sample?
- Does the jaundice need a stent or drain before treatment can start?
- Has a surgeon looked at the scans and said whether it can be removed?
- Has the case been discussed at a tumour board?
Commonly believed
What do families often get wrong about bile duct cancer?
"It is in the liver, so it is liver cancer like any other."
Cancer that starts in the bile ducts inside the liver is a different disease from hepatocellular carcinoma (HCC), the commoner liver cancer. It is tested differently and treated with different medicines. Our page on how it differs from HCC explains this.
"No jaundice means it cannot be bile duct cancer."
Jaundice is common when the cancer is outside the liver. Cancer inside the liver often grows for a long time without blocking a main duct, so many people never turn yellow until late.
"Once a stent is in, the cancer has been treated."
A stent keeps bile flowing and clears the jaundice. It does nothing to the cancer itself. It makes treatment safer to start, and treatment still has to follow.
"Gene testing is only for rich patients abroad."
Molecular testing on the tumour sample is done in India, and for intrahepatic cancer especially it can open a treatment option. Ask early, before the sample runs out. See why every biliary cancer should be tested.
Being straight with you
What this page cannot tell you
It cannot tell you which type you have. A tumour near the hilum can look like it started inside the liver, and the other way round. The final label comes from the scans, the sample and the surgeon's view together, and it is sometimes only settled after an operation.
It cannot tell you whether surgery is possible
That depends on exactly which vessels and ducts are involved, how much healthy liver would be left, and how well you are otherwise. Only a surgeon who has studied your scans can answer it. Your team will tell you where any operation would take place.
Who this does not apply to
This page does not cover gallbladder cancer, cancer that has spread to the liver from the bowel, breast or elsewhere, or a mixed tumour with both HCC and bile duct features. Each of those is planned differently. It also does not apply to children, whose liver tumours are a separate field.
CION's tumour board reviews scans and reports from anywhere. CION arranges any further scans, biopsy or endoscopy through accredited partner hospitals.Questions we are asked
Common questions about where bile duct cancer starts
Which type is more common?
Cancer at the hilum, just where the ducts leave the liver, is the commonest place overall. Intrahepatic cancer is less common, but it is being diagnosed more often around the world. Some of that rise may be better scanning and better labelling, rather than more disease.
What is a Klatskin tumour?
It is an older name for perihilar cholangiocarcinoma, the cancer that starts where the left and right bile ducts join just outside the liver. You may still see the name on reports. It means the same thing and is treated the same way.
Why is the outside-the-liver type often found earlier?
Because the duct outside the liver is narrow and carries all the bile. Even a small tumour there can block it, and the build-up of bile shows quickly as yellow eyes and dark urine. Inside the liver, bile can still drain around a growing lump.
Is the chemotherapy different for each type?
Mostly no. The usual first combination is the same for all bile duct cancers. What can differ is the next step if the tumour carries a gene change, and those changes are found more often in intrahepatic cancer. Your oncologist chooses medicines from the tumour, not only the location.
Why is it so hard to get a biopsy from the duct?
The tumour often grows along the wall of the duct rather than as a lump. Brushings taken through an endoscope may catch only a few cells. A sample that shows no cancer does not always rule it out, and the test may need to be repeated.
Can a liver transplant treat bile duct cancer?
Rarely. For a small number of people with early perihilar cancer that cannot be removed, a few specialist transplant programmes abroad offer it under strict rules. It is not a standard option in India today. Ask a surgeon if you have been told otherwise.
Does the location change what the family should watch for?
Yes. With a stent in place, fever with shivering can mean the stent is blocked and infected. Go to hospital the same day if that happens. Returning yellowness, dark urine or pale stools also need a call to your team.
Where do I start if I have just been told it is bile duct cancer?
Gather the scans on a disc, the reports and any biopsy slides. Ask which of the three places it is in and whether gene testing has been sent. Call the CION helpline and the tumour board can review what you already have before anything is repeated.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- American Cancer Society — What Is Bile Duct Cancer?
- National Cancer Institute — Bile Duct Cancer Treatment
- Cancer Research UK — Bile duct cancer (Cholangiocarcinoma)
- American Cancer Society — Bile Duct Cancer Surgery
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Intrahepatic cholangiocarcinoma: what it isThe full picture of the inside-the-liver typePerihilar cholangiocarcinoma and the Klatskin tumourIf your tumour sits where the ducts leave the liverWhy every biliary cancer should be molecularly testedThe test that can open a treatment optionTargeted therapy for bile duct cancerThe medicines matched to gene changes
Talk to us
Not sure which kind your report describes?
Send us the scans and reports you already have. The tumour board can tell you where the cancer sits, whether gene testing has been done and what the next sensible step is. One helpline serves every CION centre.