Medical Oncologist
CION Cancer Clinics
MRCP, ERCP and cholangioscopy: what each test does | CION Cancer Clinics
MRCP is a special MRI scan that maps the bile ducts without going inside you. ERCP passes a camera through the mouth to the bile duct so the doctor can take samples and place a stent. Cholangioscopy is a tiny camera inside the duct for a closer look. This page explains what each one does, the order they usually come in, and what the report words mean. 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 MRCP and ERCP?
- What can each test do, and what can it not do?
- What happens during an ERCP?
- What do the words on an MRCP or ERCP report mean?
- What do families often get wrong about these tests?
- What can this page not tell you?
- Common questions about MRCP, ERCP and cholangioscopy
The short answer
What is the difference between MRCP and ERCP?
MRCP is a picture. ERCP is a procedure. An MRCP is a special MRI scan that shows the bile ducts without anything going inside you. An ERCP passes a thin camera through the mouth into the gut, so the doctor can inject dye into the bile duct, take samples and place a stent to relieve a blockage.
Which one usually comes first
When someone turns yellow and a scan shows a narrowed bile duct, most teams want an MRCP before anyone goes inside. It maps where the narrowing starts, how far it runs into the liver and which branches are affected. That map decides whether ERCP from below, a drain through the skin, or neither, is the safer way in. It also helps the surgeon judge whether the tumour might be removable.
Where cholangioscopy fits
Cholangioscopy is a tiny camera passed up through the ERCP scope into the bile duct itself. It lets the doctor look at the lining directly and take a biopsy from exactly the spot that looks abnormal. It is used when ordinary brushings have not given an answer.
This page is about cancer that starts in the bile duct outside the liver, near where it leaves the liver or close to the pancreas. If a scan has shown a spot inside the liver itself, read liver, bile duct or gallbladder cancer first.Three tests, three jobs
What can each test do, and what can it not do?
These tests are not rivals. Each answers a different question, and many people need more than one.
MRCP: the map
An MRI scan tuned to show fluid, so the bile ducts appear bright. You lie in the scanner and hold your breath when asked. No tube, no sedation.
It cannot
- Take a sample of tissue
- Relieve the jaundice
ERCP: the hands
A specialist endoscopist passes a flexible scope through the mouth and stomach to where the bile duct opens into the gut. Dye shows the narrowing on X-ray. Brushings can be taken and a stent placed in the same sitting.
ERCP can treat the blockage as well as look at it.Cholangioscopy: the close look
A very fine camera goes up inside the duct during an ERCP. The doctor sees the lining in colour and takes targeted biopsies. It is offered at fewer centres and is usually kept for difficult cases.
EUS: the neighbour
Endoscopic ultrasound uses a scope with an ultrasound probe on its tip. It is especially useful for the lower end of the duct near the pancreas, and can guide a needle to sample a lump or a lymph node.
Not sure whether this applies to you?
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What happens during an ERCP?
Before you go
You fast from the night before. Tell the team about blood thinners, diabetes tablets and any allergy to dye. A blood test checks clotting, because cutting into the opening of the duct can bleed.
Sedation or anaesthetic
You lie mostly on your front. You are given sedation or a full anaesthetic, so most people remember very little. A mouthguard protects your teeth.
Dye, samples and a stent
The doctor injects dye, watches the X-ray screen, brushes the narrowing for cells and usually leaves a stent to drain bile past the blockage. Cholangioscopy, if needed, happens now.
Recovery and watching
You are watched for pain, fever and vomiting. Many people stay overnight. The brushing results follow later, and the yellow colour starts to fade gradually if the stent is working.
On your report
What do the words on an MRCP or ERCP report mean?
- Stricture
- A narrowing of the bile duct. It can be caused by cancer, by stones, by inflammation or by scarring. The word alone does not mean cancer.
- Hilar or perihilar
- At the point where the left and right bile ducts leave the liver and join. A tumour here is sometimes called a Klatskin tumour.
- Upstream dilatation
- The ducts above the narrowing have swollen because bile cannot get past. It shows that the blockage is real and how far back it reaches.
- Bismuth type
- A way of describing how far a narrowing at the hilum spreads into the left and right ducts. It helps the team decide where stents or drains should go.
- Brush cytology
- Cells scraped from the narrowing with a small brush during ERCP and looked at under a microscope.
- Sphincterotomy
- A small cut at the opening of the bile duct into the gut, made so a stent can pass and bile can flow freely.
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Commonly believed
What do families often get wrong about these tests?
"The MRCP showed a narrowing, so it must be cancer."
A narrowing can come from stones, inflammation, earlier surgery or a condition called primary sclerosing cholangitis. MRCP shows the shape of the duct, not what is causing it. Only tissue, or the way things behave over time, settles that.
"The brushings were negative, so we can relax."
Bile duct tumours often grow along the wall and shed few cells, so a brushing can miss them. A negative result while the narrowing still looks suspicious usually means more sampling, sometimes with cholangioscopy or EUS. It is not a reason to stop.
"ERCP is just a scan, so it carries no risk."
ERCP is a procedure. It can inflame the pancreas (pancreatitis), cause bleeding, carry infection into a blocked duct or, rarely, make a small tear in the gut. These risks are why the team plans it carefully and does not repeat it without a reason.
"If they put a stent in, the cancer has been treated."
A stent drains the bile so the liver can recover. It does nothing to the tumour itself. It is the step that makes surgery, chemotherapy or other treatment possible.
Being straight with you
What can this page not tell you?
It cannot tell you whether a narrowing on your scan is cancer. That answer comes from the images read together with blood tests, tissue and the judgement of a team who has seen the whole picture. It also cannot tell you which test you need next, because that depends on where the narrowing sits and whether surgery is being considered.
Why the order matters for surgery
If there is any chance the tumour can be removed, the surgeon needs to see good pictures before a stent is placed. A stent and the inflammation around it can blur the scan. This is one reason families are asked to wait for an MRCP or CT even when the patient is yellow. The next page, why a stent comes before treatment, explains what happens after the map is made.
Who this does not apply to
If your jaundice came with a known tumour inside the liver, or with cirrhosis, the tests and the reasoning are different. Read blockage jaundice versus liver-failure jaundice. CION's oncologists and tumour board review your scans. MRCP, ERCP, EUS and cholangioscopy are arranged through accredited partner hospitals and gastroenterologists.
Questions we are asked
Common questions about MRCP, ERCP and cholangioscopy
Is MRCP better than ERCP for finding bile duct cancer?
They do different jobs. MRCP is safer and better for mapping the ducts before any decision is made. ERCP is better when you also need samples or a stent. Most doctors prefer MRCP first, then ERCP only if something needs to be done inside the duct.
Does an MRCP need an injection of dye?
The bile duct pictures themselves do not need dye, because they rely on the fluid already in the ducts. Many centres add a contrast injection to look at the liver, blood vessels and lymph nodes in the same visit. Tell the team about kidney problems and any metal in your body.
Is ERCP painful?
You are sedated or asleep, so most people feel little during it. A sore throat and some bloating afterwards are common. Strong pain in the upper abdomen, especially going through to the back, needs to be reported straight away, because it can be a sign of pancreatitis.
Why did my brushing come back inconclusive?
Bile duct tumours often grow inside the wall and give off few cells. The brush may simply not collect enough. It does not mean the doctor did anything wrong. The team may repeat sampling, add cholangioscopy or EUS, or rely on the overall picture.
Can ERCP be done if the patient is very yellow and weak?
Often yes, and relieving the blockage is usually what helps them feel better. If there is fever or shivering with the jaundice, go to hospital today, because drainage becomes urgent. Where ERCP cannot reach the blockage, a drain through the skin into the liver is the other route.
What is cholangioscopy used for?
It lets the doctor look directly at the inside of the bile duct and take a biopsy from the exact spot that looks wrong. It is mainly used when earlier samples were unclear. It needs special equipment and experience, so it is not offered everywhere.
Should the tissue be tested for gene changes?
Yes, if cancer is confirmed and there is enough tissue. Bile duct cancers should have molecular profiling, because some carry changes with targeted options. Read why molecular testing matters. No result is promised in advance.
Can CION look at our MRCP before deciding on ERCP?
Yes. Bring the scan images on a disc or a link, along with the written report and recent blood tests. A CION oncologist can review them, and the tumour board can discuss what should come next. One helpline serves every CION centre.
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 — Bile Duct Cancer Diagnostic Tests
- National Cancer Institute — Bile Duct Cancer Treatment
- Cancer Research UK — Bile duct cancer (Cholangiocarcinoma)
- Macmillan Cancer Support — Bile duct cancer (cholangiocarcinoma)
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
Why a stent comes before any cancer treatmentWhat happens once the ducts have been mappedPerihilar cholangiocarcinoma and the Klatskin tumourThe cancer these tests are most often looking forHow perihilar bile duct cancer is stagedHow the scan findings turn into a stagePET-CT for gallbladder and bile duct cancerWhen a whole-body scan is added
Talk to us
Not sure whether you need an MRCP or an ERCP next?
Send us the scans and reports you already have, and a CION oncologist can review them with the tumour board before the next step is decided. One helpline serves every CION centre.