Medical Oncologist
CION Cancer Clinics
How much of the liver can be safely removed? | CION Cancer Clinics
In a healthy liver, surgeons can often remove more than half, and the rest regrows. With cirrhosis or a damaged liver, much less can be taken safely. The limit is set by what stays behind: its size, its health and its blood supply. This page explains how surgeons measure that, and what happens when too little would be left. At CION Cancer Clinics, a multidisciplinary tumour board weighs your liver function and your scans before recommending any treatment.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed October 2026, next review due October 2027
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On this page
- How much of the liver can a surgeon take out?
- Why can one person lose more liver than another?
- How do surgeons work out the safe amount for you?
- The words surgeons use, in plain language
- What if too little liver would be left?
- What this page cannot tell you
- Common questions about how much liver can be removed
The short answer
How much of the liver can a surgeon take out?
In a healthy liver, surgeons can often remove more than half and the rest will cope and grow back. In a liver damaged by cirrhosis, fibrosis or heavy chemotherapy, far less can be taken safely, because the part left behind has less working tissue in it.
The real question is what stays behind
Surgeons do not start by asking how much they can remove. They ask how much healthy, well-connected liver will be left, and whether it is enough to do the liver's daily work while it regrows. That remaining part is called the future liver remnant. Its size and its quality matter equally.
Who this page is for
It is written for people facing an operation for a tumour in the liver, most often hepatocellular carcinoma (HCC), the cancer that starts in the liver. The same principle applies to bile duct cancer inside the liver and to cancer that has spread to the liver, but the decisions for spread from the bowel sit with the colon cancer team.
There is no single safe amount for everyone. The answer is worked out for each person from their own scans and blood tests.What decides the limit
Why can one person lose more liver than another?
Four things set the limit, and the surgeon looks at all of them together.
How healthy the liver is
A soft, healthy liver regrows quickly and copes with a large operation. A scarred liver regrows slowly, if at all, so a much bigger part must be left behind.
Things that weaken it
- Cirrhosis from hepatitis B or C, alcohol or fat
- Heavy fatty liver
- Several rounds of chemotherapy before surgery
- Jaundice from a blocked bile duct
How big the remaining part is
The liver is not the same size in everyone. Surgeons measure the part that would stay on a CT scan and compare it with your body size, not with an average.
Whether it keeps its blood supply and drainage
Every part of the liver left behind needs blood coming in, blood going out and a bile duct draining it. A large remnant is no use if the tumour forces the surgeon to cut those connections.
How fit you are
Age alone does not decide it, but heart, lung and kidney health affect how well the body copes while the liver recovers. See surgery with other illnesses.
Not sure whether this applies to you?
Ask an oncologistBefore the operation
How do surgeons work out the safe amount for you?
A detailed scan
A triple-phase CT or MRI maps the tumour, the vessels and the segments of the liver. Software can measure the volume of the part that would remain. CION arranges these scans through diagnostic partners.
Blood tests of liver function
Bilirubin, albumin, clotting (INR) and platelet counts show how well the liver is working now. These feed into the Child-Pugh grade.
Extra tests if the liver is scarred
A liver stiffness scan, an endoscopy for varices, or a specialised function test may be added to judge the reserve more precisely.
A tumour board decision
Surgeons, oncologists, radiologists and hepatologists agree whether the planned remnant is enough, or whether it needs to be grown first.
On your report
The words surgeons use, in plain language
- Future liver remnant
- The part of the liver that will be left after the operation. Read more on how it is calculated.
- Segment
- The liver is divided into eight sections, each with its own blood supply and bile duct. Operations are planned around them.
- Segmentectomy
- Removing one segment. Often used when the liver is scarred and little can be spared.
- Hemihepatectomy
- Removing the right or left half of the liver. The right side is usually the bigger half.
- Post-hepatectomy liver failure
- When the remaining liver cannot cope after surgery. It is the main reason surgeons are careful about how much they take.
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Did you know
A healthy liver regrows to close to its original size within a few months of a large operation. It does not regrow the exact shape, but it regains the work. A cirrhotic liver regrows far less, which is why the amount removed has to be smaller.
When the remnant is too small
What if too little liver would be left?
Surgery is not always off the table. In selected people the remaining part can be made to grow before the operation. The usual way is portal vein embolisation, which blocks the blood flow to the side with the tumour so the healthy side grows. Sometimes the operation is done in two stages for the same reason. These procedures are coordinated through partner hospitals with interventional radiology.
Who this does not suit
Growing the liver works poorly when the liver is badly scarred, when the pressure in the liver veins is high, or when the tumour is growing fast. In those situations the team usually looks at other treatments instead, such as ablation, TACE or a transplant assessment. Read why a small tumour sometimes cannot be removed.
It also does not apply to a tiny tumour at the edge
When only a small wedge is needed, the remnant question rarely arises. These calculations matter most for large or central tumours.
Being straight with you
What this page cannot tell you
It cannot tell you how much of your liver can be removed. That number comes from your own scan measurements and liver tests, judged by a liver surgical team. Two people with the same tumour can have very different safe limits.
It cannot predict how you will recover
Recovery depends on the size of the operation, the health of the liver and the person. Your surgeon can explain the specific risks of the operation planned for you, including the chance that the liver is slow to recover.
Who can answer
A surgical oncologist, working with a hepatologist and the tumour board, can show you on your own scan which part would be removed and which would remain. CION's surgical oncologists assess and plan liver operations, and your team will tell you where the operation takes place. Ask to see the plan on the images. It makes the numbers far easier to understand.
Questions we are asked
Common questions about how much liver can be removed
Can a person live with half a liver?
Yes, if the half that remains is healthy. It takes over the full workload and grows back over the following months. With cirrhosis, half is usually far too much to remove, which is why the health of the liver matters as much as the amount.
Does the liver really grow back?
A healthy liver regrows to near its original size, though not its original shape. A scarred liver regrows much less. Read more on whether the liver grows back and how long it takes.
Why is less allowed after chemotherapy?
Several rounds of some chemotherapy drugs can injure liver tissue, making it fattier or affecting its small blood vessels. The liver works and regrows less well for a while, so surgeons leave a larger remnant and may plan a gap between chemotherapy and surgery.
What happens if too much is removed?
The remaining liver may fail to keep up. Jaundice, fluid in the abdomen, confusion and bleeding problems can follow, and it can be life-threatening. Careful measurement before surgery exists to prevent this, which is why surgeons sometimes decline an operation.
Is keyhole surgery limited to smaller removals?
Not strictly. Keyhole and robotic approaches are used for many liver operations, including larger ones in experienced hands. The safe amount of liver to remove is the same whichever approach is used. The approach changes the wound, not the limit.
Can I donate part of my liver and still be well?
Living donation is a separate decision with its own strict safety rules for the donor, and it carries real risk. It is assessed only at licensed transplant centres. Selling or buying organs is illegal in India. This page is about removing a tumour, not about donation.
Does fatty liver change how much can be removed?
It can. Heavy fat in the liver lowers its reserve and slows regrowth, so surgeons may leave more behind. Mild fatty liver usually changes little. Your scans and blood tests show which applies to you, and the surgeon will explain it.
Who decides the final plan?
The operating surgeon, after review by a tumour board that includes oncologists, radiologists and hepatologists. You can ask to see the plan on your scan. Call the CION helpline to arrange a consultation with a surgical oncologist.
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 — Surgery for Liver Cancer
- Cancer Research UK — Surgery for liver cancer
- MDCalc — Child-Pugh Score for Cirrhosis Mortality Calculator
- EASL — EASL Clinical Practice Guidelines: management of hepatocellular carcinoma
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
Future liver remnant: the number surgeons calculateHow the remaining part is measuredPortal vein embolisation to grow the remaining liverWhat can be done when too little would be leftDoes the liver grow back after surgery?What regrowth means in practicePost-hepatectomy liver failureThe risk these limits exist to prevent
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Share your scans and reports, and a surgical oncologist will explain which part would be removed and why. One helpline serves every CION centre.