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Segmentectomy and wedge resection of the liver: the small operations explained | CION Cancer Clinics
A segmentectomy removes one whole segment of the liver along its natural boundaries. A wedge resection removes a small piece around the tumour without following any boundary. Both are minor liver operations that leave most of the liver in place. This page explains when a surgeon chooses one over the other, what happens in the operating theatre, and what the words on your report mean. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What is a liver segmentectomy, and what is a wedge resection?
- When is each one chosen?
- What actually happens during the operation?
- What families say about small liver operations, and what is true
- Words on the surgical plan and pathology report, explained
- What can this page not tell you?
- Common questions about segmentectomy and wedge resection
The short answer
What is a liver segmentectomy, and what is a wedge resection?
A segmentectomy removes one whole segment of the liver, following the natural boundaries of its blood supply. A wedge resection removes a small piece of liver around a tumour without following any boundary at all. Both are minor liver resections. Both leave most of the liver in place.
Why the liver can be cut this way
The liver is built from eight segments. Each has its own branch of the portal vein and hepatic artery bringing blood in, and its own bile duct carrying bile out. So a surgeon can remove one segment cleanly, tying off its vessels, and the neighbours carry on as before. A wedge ignores those boundaries and simply takes the tumour with a rim of healthy tissue.
Which one you are offered
The choice depends on where the tumour sits and what kind of cancer it is. A small tumour near the surface can often be taken as a wedge. A tumour buried within one segment, or a primary liver cancer that spreads along the segment's own vessels, is more often taken as a whole segment. The consent form will name the operation, and it is fair to ask why.
Neither operation tells you anything about stage. Small operations are done for cancers that have spread, and large ones for cancers that have not.What the team weighs
When is each one chosen?
The same tumour can be handled either way at different centres. These are the things that usually tip the decision.
A wedge for a tumour near the surface
If the tumour sits close to the edge of the liver and away from the main vessels, a wedge removes it with a clear rim and very little healthy tissue. This is the smallest liver operation there is.
A segment for a tumour buried inside
If the tumour is deep within one segment, cutting a wedge around it would cross the vessels that feed the rest of that segment. Taking the whole segment is cleaner and the margin is easier to judge.
A segment for primary liver cancer
Cancer that starts in the liver itself tends to spread along the small veins of the segment it sits in. Many surgeons prefer to remove the whole segment for that reason, when the liver is healthy enough to allow it.
Usually weighed against
- How scarred the liver is
- How much liver would remain
Several wedges for scattered spread
When bowel cancer has spread to the liver as several small deposits, the team may take each one as a separate wedge rather than remove a large block. This keeps as much working liver as possible.
Not sure whether this applies to you?
Ask an oncologistIn the operating theatre
What actually happens during the operation?
Anaesthetic and the cut
You are fully asleep throughout. Depending on the centre and where the tumour lies, the surgeon works through several small cuts with a camera, or through one larger cut below the ribs.
Ultrasound on the liver itself
A small probe is placed directly on the liver to confirm the tumour's position and check for anything the scans missed. This is the moment the planned operation is confirmed or adjusted.
Dividing the liver tissue
The surgeon marks the line of the cut and divides the liver slowly, sealing each small vessel and bile duct as it appears. For a segment, the feeding vessels are tied off first so the segment changes colour and shows its own boundary.
Checking and closing
The cut surface is checked for bleeding and bile leakage. A drain may be left near the surface for a few days. The tumour goes to the pathology laboratory to check the margin.
Commonly believed
What families say about small liver operations, and what is true
"It is only a small piece, so it must be a simple operation."
The piece is small, but the liver is one of the most blood-rich organs in the body and sits under the ribs next to large veins. A wedge is a shorter operation than a major resection, but it still needs a surgeon who does liver work regularly.
"A wedge is not a proper cancer operation."
A wedge with a clear margin removes the tumour just as completely as a segment does. For spread from bowel cancer it is often the preferred operation, because keeping liver in reserve matters if more surgery is ever needed.
"They will take the whole segment just to be safe."
More liver removed is not automatically safer. In a scarred liver, taking extra tissue is the risk. The team removes what the tumour needs, and no more.
"After this he cannot have any more surgery."
A minor resection leaves most of the liver, and the liver regrows what it loses. If the cancer returns, a second operation is often still possible. That is one reason surgeons keep the first one small when they can.
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On your report
Words on the surgical plan and pathology report, explained
- Anatomical resection
- An operation that follows the liver's own boundaries, removing a whole segment or several segments together. A segmentectomy is one.
- Non-anatomical resection
- An operation that ignores those boundaries and takes only the tumour with a rim around it. A wedge resection is one.
- Metastasectomy
- Removal of a deposit that has spread to the liver from elsewhere, most often from the bowel. Usually done as a wedge.
- Margin
- The rim of healthy tissue around the tumour in the removed piece. A clear margin means no cancer cells were found at the edge.
- R0
- The pathologist's shorthand for a clear margin. R1 means cancer cells reached the edge of what was removed.
- Parenchyma
- The working tissue of the liver itself, as distinct from its vessels and ducts. "Parenchyma-sparing" means keeping as much of it as possible.
Did you know
The liver is the only organ that regrows most of what it loses. After a wedge or a segment is removed, the rest expands over the following weeks until it is doing the full job again, which is why these operations can sometimes be repeated if a cancer comes back.
Being straight with you
What can this page not tell you?
It cannot tell you whether a wedge or a segment is right for you. That comes from your scan, your liver function and the type of cancer, and only the treating team holds all three. It cannot tell you the stage, and it cannot tell you what will happen after the operation.
Who these operations do not suit
They do not suit a tumour wrapped around a main vessel, which needs a larger resection. They do not suit a liver so badly scarred that even a small operation is unsafe, where heat treatment or medicines may be offered instead. And they are not offered when the cancer has spread widely outside the liver, because removing one deposit would not change the course of the disease.
Questions worth asking
Ask which operation is planned and why. Ask whether it can be done through small cuts at your centre. Ask what the surgeon will do if the ultrasound on the day shows more than the scan did. Ask how the margin will be reported and when you will hear the result.
Bring every scan and report to the appointment, including the ones you think are too old to matter.Questions we are asked
Common questions about segmentectomy and wedge resection
Is a wedge resection done by keyhole surgery?
Often, yes, when the tumour is near the surface and the centre has that experience. Keyhole means smaller cuts and usually a quicker recovery, but not every tumour position allows it. Ask your centre what they would recommend for your scan, and what would make them switch to an open cut on the day.
How long will she be in hospital?
Shorter than for a major resection, and shorter again if it was done through small cuts. The team watches blood tests, drain output and eating before discharge. Ask what is typical for the operation planned at your centre, because it varies with age and general health.
Will the liver work normally afterwards?
After a minor resection, almost always. Most of the liver is untouched, and what was removed is made up over the following weeks. Blood tests may be a little off in the first days and then settle. A scarred liver takes longer to recover, which is why the team checks liver function before agreeing to operate.
What if the margin comes back positive?
It means cancer cells reached the edge of the piece removed. It does not mean cancer was left behind, because the cut surface is treated during surgery, but the team will discuss it at the tumour board and may suggest closer follow-up or further treatment. Ask them to explain the report line by line.
Can a wedge be done for more than one tumour?
Yes. Several small deposits can each be taken as a separate wedge in the same operation, as long as each can be removed with a clear rim and enough liver remains. This is common for bowel cancer that has spread to the liver.
Is there a drain, and when does it come out?
Often a thin tube is left near the cut surface to carry away any fluid or bile. The team checks how much comes out and what colour it is, and removes it once the output is low and clear. Some surgeons do not use a drain at all for a small wedge.
Does a segmentectomy count as major surgery?
No. Removing one or two segments is classed as a minor resection. Major means three or more segments. Minor does not mean trivial, because the liver bleeds easily, but the recovery is usually lighter and the liver left behind is much larger.
Is it covered by Aarogyasri or my insurance?
Liver resection for cancer is usually covered when it is part of an approved treatment plan. Aarogyasri, CGHS, ECHS and EHS are accepted at CION, and most cashless insurers are empanelled. Call the helpline with your scheme or policy details and we will check your cover before you travel.
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Sources
- Cancer Research UK — Surgery for liver cancer
- Cancer Research UK — Surgery for secondary liver cancer
- National Cancer Institute — Adult Primary Liver Cancer Treatment (PDQ)
- American Cancer Society — Surgery for liver cancer
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
Major vs Minor HepatectomyWhere these small operations sit against the large onesLiver Resection for Colorectal Liver MetastasesThe commonest reason for a wedge resectionLaparoscopic and Robotic Liver ResectionWhen small cuts are possibleThe Pathology Report After SurgeryWhat margin and R0 mean on the reportRecovery Timeline After Liver ResectionWhat the weeks after the operation look like
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Been offered a liver operation?
Send us the scan report and the surgical plan, or call the helpline. A surgical oncologist will explain what is being proposed and why. One helpline serves every CION centre.