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CION Cancer Clinics
Anatomical or non-anatomical liver resection: what is the difference? | CION Cancer Clinics
An anatomical resection removes a whole section of the liver along its natural blood supply. A non-anatomical resection removes the tumour with a rim of healthy liver and spares the rest. Which one a surgeon chooses depends on the tumour, how healthy the remaining liver is, and how fit you are. This page explains both in plain words and what to ask. 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
- What is the difference between anatomical and non-anatomical liver resection?
- How do the two operations compare?
- How does the surgeon decide which one to do?
- Is a bigger operation always the safer choice for cancer?
- When is neither type of resection the right choice?
- What this page cannot tell you
- Common questions about anatomical and non-anatomical resection
The short answer
What is the difference between anatomical and non-anatomical liver resection?
An anatomical resection removes a whole section of the liver along its natural borders, following the blood vessels that feed that section. A non-anatomical resection removes the tumour with a rim of healthy liver around it, wherever it sits, and keeps as much of the rest as possible. Both are real cancer operations, and both aim to take the whole tumour out.
Why the liver has borders at all
The liver looks like one solid organ, but inside it is divided into eight sections called segments. Each segment has its own branch of the portal vein bringing blood in and its own bile duct draining out. Our page on the parts of the liver explains this map in more detail.
Who this page is for
This page is about primary liver cancer, mainly hepatocellular carcinoma (HCC), the cancer that starts in the liver's own cells. If your cancer began in the bowel and spread to the liver, the surgical thinking is different, and your colorectal team will explain it. The operation itself is described on our segmentectomy and wedge resection page.
Your surgeon chooses the type of resection for your tumour and your liver. Neither is better for everyone.Side by side
How do the two operations compare?
Anatomical resection
Non-anatomical resection
Removes one or more whole segments along their blood supply
Removes the tumour with a rim of normal liver, ignoring segment borders
Takes out the tiny vessels around the tumour where cancer cells may travel
Leaves more working liver behind for the body to rely on
Usually needs a healthier liver with more spare capacity
Often chosen when cirrhosis has left little spare capacity
Suits a tumour sitting well inside one segment
Suits a small tumour near the surface or between segments
Also called segmentectomy, sectionectomy or hepatectomy
Also called wedge, limited or parenchyma-sparing resection
What the team weighs
How does the surgeon decide which one to do?
The choice comes from three things looked at together: the tumour, the liver around it and the person.
The tumour
Its size, how many there are, where they sit and whether they touch a major blood vessel. HCC tends to spread through the small portal vein branches of its own segment, which is the main argument for removing the whole segment when the liver allows it.
The liver around it
A liver scarred by cirrhosis has less reserve. Removing a whole segment may leave too little working liver. The team estimates the future liver remnant, the part that will stay behind, before deciding how much can go.
Pressure in the liver's veins
Raised pressure in the portal vein, called portal hypertension, makes any liver operation riskier. Blood tests, scans and sometimes an endoscopy help the team judge this.
The person
Age alone does not decide it. Heart and lung health, diabetes, nutrition and muscle strength all affect how well someone recovers from a larger operation.
Not sure whether this applies to you?
Ask an oncologistCommonly believed
Is a bigger operation always the safer choice for cancer?
"Taking out more liver always means less chance of the cancer coming back."
Studies comparing the two approaches in HCC have given mixed answers. Some suggest anatomical resection lowers the chance of cancer returning near the original spot, especially for certain tumours. Others find little difference once tumour size and liver health are taken into account.
"A wedge resection is a half-measure."
A non-anatomical resection still aims for a clear margin, a rim of healthy tissue with no cancer cells at its edge. For a small tumour in a cirrhotic liver it is often the safer operation, because the liver left behind has to keep the person alive.
"If the tumour is small, any surgeon can just cut it out."
Size is only part of it. A small tumour deep in the liver, or beside a major vessel, can need a larger operation than a bigger one near the surface. In a scarred liver, that can make surgery unsafe.
"New cancer after surgery means the operation was done badly."
A cirrhotic liver can grow a brand-new tumour in a different place years later. That is why follow-up scans continue after any resection.
Who this does not suit
When is neither type of resection the right choice?
Some people are not offered either operation, even for a small tumour. The most common reason is advanced cirrhosis. When the liver is already struggling, removing any part of it can tip it into failure. Our page on why a small tumour sometimes cannot be removed goes through this in detail.
When another treatment may fit better
For a small tumour in a liver that cannot spare tissue, ablation can destroy the tumour with heat through a needle. For someone whose cirrhosis is the bigger threat, a transplant may treat both problems at once. Several tumours spread through the liver usually point towards treatments such as TACE or medicines instead of surgery.
Where CION fits in
CION's surgical oncologists assess whether surgery is possible and which kind, and the tumour board reviews the scans alongside the medical oncologists. Scans, ablation and transplant assessment are coordinated through accredited partner hospitals. If surgery is advised, your team will tell you where the operation takes place.
Being straight with you
What this page cannot tell you
It cannot tell you which operation suits your tumour. That depends on your scans, your liver blood tests, the pressure in your liver's veins and how fit you are. Only a surgeon who has seen all of these together can make that call.
It cannot predict your outcome
The research comparing these two operations is still being argued over. Results from one group of patients do not tell you what will happen to you. Ask your surgeon why they chose the approach they did, and what the alternatives would mean for you.
It cannot read your pathology report
After surgery, the report describes the margin and whether cancer was seen in small vessels. Our page on what margins mean explains the words, and your surgeon will explain what they mean for your plan.
If two doctors have suggested different operations, a second opinion from a tumour board can help you understand why.Questions we are asked
Common questions about anatomical and non-anatomical resection
Which type of resection is better for liver cancer?
Neither is better for everyone. Anatomical resection removes more of the tissue where HCC tends to spread, while non-anatomical resection keeps more working liver. In a healthy liver, surgeons often lean towards anatomical resection. In a cirrhotic liver, keeping liver tissue usually matters more.
What does segmentectomy mean on my report?
It means one whole segment of the liver was, or will be, removed along its natural borders. It is a type of anatomical resection. A sectionectomy removes two neighbouring segments, and a hepatectomy removes a larger part, such as the whole right or left side of the liver.
Is a wedge resection a proper cancer operation?
Yes. A wedge resection removes the tumour with a rim of healthy liver around it. The aim is still a clear margin, meaning no cancer cells at the cut edge. It is often the choice for a small tumour near the surface, or when the liver cannot spare more tissue.
Can the surgeon change the plan during the operation?
Sometimes. An ultrasound probe placed directly on the liver during surgery can show the tumour and vessels more clearly than a scan from outside. Occasionally it finds something new. Ask your surgeon beforehand what they would do in that case, so the family is not surprised afterwards.
Does anatomical resection mean a longer recovery?
Usually a larger operation means a slower recovery, though it depends more on how much liver is removed and how healthy the rest is. A small anatomical resection of one segment can be a modest operation. Your surgeon can tell you what to expect for your own plan.
I have cirrhosis. Can I still have anatomical resection?
Some people with mild, well-compensated cirrhosis can. The team checks liver blood tests, the Child-Pugh grade, signs of portal hypertension and the size of the liver that would remain. If any of these are unfavourable, a smaller resection or a different treatment is usually safer.
Does the type of resection change follow-up?
Not much. Everyone who has surgery for HCC needs regular scans and blood tests afterwards, because a liver with ongoing disease can form new tumours. Your team will set a follow-up plan based on your pathology report and your liver health, whichever operation you had.
How can I get my surgical plan reviewed?
Bring your scans on a disc, your reports and your liver blood tests. CION's surgical oncologists and tumour board can review the plan and explain why one approach was chosen. Call the CION helpline and someone will tell you what to bring.
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
- EASL — EASL Clinical Practice Guidelines: management of hepatocellular carcinoma
- National Cancer Institute — Liver Cancer Treatment
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
Segmentectomy, lobectomy and extended resectionThe names of each operation, from smallest to largestFuture liver remnantHow surgeons work out how much liver must stay behindWhy a small tumour sometimes cannot be removedThe cirrhosis question most families askMargins: what R0 and R1 meanReading the pathology report after surgery
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Not sure why your surgeon chose this operation?
Send us your scans and liver reports, and our surgical oncologists and tumour board can explain the options for your tumour and your liver. One helpline serves every CION centre.