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Focal nodular hyperplasia (FNH) of the liver, explained | CION Cancer Clinics
Focal nodular hyperplasia, or FNH, is a harmless liver lump made of normal liver cells. It is not cancer, it does not become cancer, and most people never need treatment. The key step is confirming it on a good contrast scan, usually an MRI. This page explains how FNH is told apart from other lumps, what your report means and when more is needed. At CION Cancer Clinics, our team goes through your scan, blood test and biopsy reports with you and plans the next step.
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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 focal nodular hyperplasia, and is it cancer?
- What else could the lump be, and how do doctors tell?
- What happens after a scan suggests FNH?
- What do the words on an FNH report mean?
- Four worries people bring, and what is actually true
- What this page cannot tell you
- Common questions about focal nodular hyperplasia
The short answer
What is focal nodular hyperplasia, and is it cancer?
Focal nodular hyperplasia, usually shortened to FNH, is a harmless lump made of normal liver cells arranged in an unusual way. It is not cancer, it does not turn into cancer, and most people who have one never need treatment. It is the second commonest harmless liver lump after a haemangioma.
Why it forms
The leading explanation is that a small artery inside the liver grew a little differently, and the liver cells around it responded by growing into a firm knot. That is why many FNH lesions have a small scar with a vessel at the centre. Nobody did anything to cause it. It is found most often in women in their younger adult years, but men and older adults have it too.
How it is usually found
Almost always by chance, on an ultrasound done for something else. FNH rarely causes symptoms. The word "lesion" or "SOL" on that first report can be frightening, but on its own it only means "something is there". Our page on a spot found on the liver explains those first days.
This page is about FNH in a liver that is otherwise healthy. A lump in a cirrhotic liver is read by different rules.Telling it apart
What else could the lump be, and how do doctors tell?
An ultrasound alone usually cannot name an FNH. The question is which of these it might be, and a contrast scan answers it.
Haemangioma
A tangle of blood vessels, also harmless. It fills with contrast from the edges inward, which looks quite different from FNH.
Hepatic adenoma
The lump most often confused with FNH, and the one that matters, because some adenomas bleed or, rarely, change. Adenomas are watched more closely. See hepatic adenoma.
A cancer that started in the liver
Rare in a young person with a healthy liver. One uncommon type, fibrolamellar cancer, also has a central scar, which is why an unusual-looking FNH is never simply waved away.
Spread from another cancer
Considered first in anyone with a known cancer elsewhere.
What points to FNH
- A bright flush of contrast early on
- A central scar
- Holding liver-specific contrast late on MRI
Not sure whether this applies to you?
Ask an oncologistAfter it is found
What happens after a scan suggests FNH?
A contrast MRI
A liver MRI, ideally with a contrast dye that liver cells absorb, is the scan most likely to confirm FNH. CION arranges it through its diagnostic partners. Bring every earlier scan and report.
A specialist reading
The images are read by a radiologist used to liver lesions, and reviewed by the tumour board if anything looks unusual. A second reading of the actual images can settle doubt.
A biopsy only if needed
Most FNH is confirmed without a needle. A liver biopsy is kept for the few where scans cannot decide between FNH and adenoma or something else.
A clear written plan
Once FNH is confirmed, many people need no further scans. If one is advised, ask for the reason and the timing in writing.
On your report
What do the words on an FNH report mean?
- Arterial enhancement
- The lump lights up brightly in the first seconds after contrast, because it has a strong arterial blood supply. FNH does this, and so do some cancers, so this alone proves nothing.
- Central scar
- A small star-shaped area in the middle of the lump, often holding a vessel. Typical of FNH, though not seen in every one.
- Washout
- The lump turning darker than the liver in later pictures. FNH usually does not wash out, and this is one sign that points away from cancer.
- Hepatobiliary phase
- Late MRI pictures taken after liver cells have absorbed a special contrast. FNH usually holds it, while most adenomas and cancers do not.
- Iso-intense
- Looks about as bright as the normal liver around it, which is common in FNH because it is made of liver cells.
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Commonly believed
Four worries people bring, and what is actually true
"Any lump in the liver should be removed to be safe."
FNH does not turn into cancer and almost never causes trouble. Removing it means a liver operation with real risks and nothing to gain. Surgery is kept for the rare FNH that causes clear symptoms or where the diagnosis stays in doubt.
"The contraceptive pill caused it, so I must stop it."
The link between the pill and FNH is weak, unlike adenoma. Many doctors do not ask women with FNH to stop. Do not stop or start anything on your own. Discuss it with your doctor.
"It means my liver is weak, so I should avoid protein."
FNH sits in an otherwise normal liver. It does not need a special diet, and cutting protein can do harm.
"A liver tonic or detox will dissolve it."
Nothing taken by mouth shrinks FNH, and some herbal products can damage the liver. Tell your doctor about anything you take, without worrying about being judged.
Being straight with you
What this page cannot tell you
It cannot tell you whether the lump on your report is FNH. Words like "likely FNH" or "suggestive of FNH" on an ultrasound report are a suggestion, not a diagnosis. If the report recommends an MRI or triple-phase CT, have it. That scan is what turns a guess into an answer, and skipping it is the one real mistake people make with a lump like this.
Who this does not apply to
If you have cirrhosis, hepatitis B or C, heavy alcohol use, or a known cancer anywhere in the body, a new liver lump should not be assumed to be FNH. Different rules apply, explained on a lesion in a cirrhotic liver. Children with liver lumps are assessed differently too.
Who can answer your question
A radiologist reading the actual images, and a liver specialist or oncologist reviewing them with your history, can tell you what the lump is and whether anything more is needed. If you are unsure whether your report has been read carefully enough, a second opinion on the images is reasonable.
Call the helpline and describe your report. Someone will tell you honestly what the next step should be.Questions we are asked
Common questions about focal nodular hyperplasia
Can FNH turn into cancer?
No. Focal nodular hyperplasia is not known to turn into cancer. The important step is making sure the lump really is FNH, which is why a good contrast MRI matters. Once that is settled, there is no reason to fear it changing later.
Does FNH need treatment?
Almost never. Most FNH is left alone for life. Surgery is considered only in rare cases, when the lump clearly causes symptoms or when scans cannot rule out something else. If an operation is suggested, ask why, and consider a second opinion on the images.
Will I need scans for the rest of my life?
Usually not. Once FNH is confirmed on a good scan, many doctors advise no routine follow-up. Some suggest one repeat scan if the first was not fully typical. Ask for the plan in writing. Our page on lifelong scans explains more.
Can FNH cause pain?
It rarely does. If you have pain in the upper abdomen, acidity, gallstones and muscle strain are much more likely causes. Your doctor will look for those first. A very large FNH pressing on nearby organs can occasionally cause discomfort.
Can I get pregnant if I have FNH?
Most women with FNH have pregnancies without any problem from it. Tell your obstetrician that you have it, and mention it to your liver doctor if you are planning a pregnancy. They will tell you whether a scan is needed before or during it.
Is FNH the same as a hepatic adenoma?
No, though they can look alike on an ultrasound. An adenoma can bleed and occasionally change, so it is watched more closely and sometimes removed. FNH does neither. A contrast MRI is usually what tells the two apart.
Should I stop alcohol or change my diet?
FNH does not need a special diet. General advice on alcohol and healthy eating applies to everyone, and it is good for the liver. Do not cut protein or take liver tonics because of FNH. Ask your doctor before starting any herbal product.
Who should I see about an FNH report?
A doctor who can review the actual MRI or CT images with your history, ideally someone who sees liver lesions regularly. Call the CION helpline and you will be guided to the right clinic to have your scans reviewed.
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
- Liver UK (formerly British Liver Trust) — Benign liver tumours
- NHS — MRI scan
- American College of Radiology — ACR Liver Imaging Reporting & Data System (LI-RADS®)
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.
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