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Segmentectomy and wedge resection, explained | CION Cancer Clinics
Both operations remove less than a whole lobe of the lung. A segmentectomy removes one natural segment along its own artery, vein and airway, and takes the lymph glands with it. A wedge resection staples out a piece of lung around a nodule without following any natural boundary. This page explains what each involves, when surgeons use one rather than the other, and what to ask before you consent. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- What is the difference between a segmentectomy and a wedge resection?
- Segmentectomy and wedge resection, compared
- Which situations call for which operation?
- What happens during a sublobar operation?
- Words you will meet on the surgery and pathology reports
- Three things families tell us, and what is actually true
- What this page cannot tell you
- Common questions about segmentectomy and wedge resection
The short answer
What is the difference between a segmentectomy and a wedge resection?
Both remove less than a whole lobe of the lung. A segmentectomy removes one natural segment of a lobe, following its own artery, vein and airway, and takes the lymph glands with it. A wedge resection staples out a wedge-shaped piece of lung around a nodule without following any natural boundary, and usually takes no glands.
Why the distinction matters
A segmentectomy is a cancer operation in its own right. It clears the segment's drainage and gives the pathologist glands to examine, so the stage can be set properly. A wedge is quicker and simpler, but it leaves the glands behind and takes a narrower rim of healthy lung around the nodule. That makes it the right tool for some jobs and the wrong tool for others.
Who these smaller operations do not suit
Neither is usually offered for a large tumour, one near the centre of the lung, or one already known to involve the glands. In those cases a lobectomy, or a sleeve resection, is needed to clear the disease. The smaller operations are for small nodules near the edge, or for people whose breathing reserve cannot afford a whole lobe.
This page explains the two operations. It cannot tell you which, if either, is right for you.Side by side
Segmentectomy and wedge resection, compared
Segmentectomy
Wedge resection
Removes a whole natural segment, along its own vessels and airway
Removes a wedge of lung around the nodule, ignoring segment lines
Lymph glands at the segment root are removed and examined
Usually no glands removed unless added deliberately
A wider rim of healthy lung around the tumour
A narrower rim, set by where the stapler can reach
Longer and more demanding to perform; needs the segment anatomy mapped
Shorter and simpler; often done to get a diagnosis
Chosen as a cancer operation for a small tumour near the edge
Chosen for diagnosis, for spread from another cancer, or when reserve is very limited
When each is used
Which situations call for which operation?
These are the usual patterns. Your surgeon may have a reason to depart from them, and it is fair to ask what it is.
A small cancer near the edge of the lung
A segmentectomy is often offered when the tumour is small, sits in the outer part of the lung and the scan shows no gland involvement. The glands are still checked during the operation.
A nodule that needs a diagnosis
When a needle biopsy is not possible or has failed, a wedge removes the nodule whole. It is examined while you are still asleep. If it is cancer, the surgeon may go on to a larger operation in the same sitting, if that was agreed with you beforehand.
Cancer that has spread to the lung from elsewhere
A deposit from a bowel, kidney or other cancer is usually removed by a wedge. The aim is to take the deposit with a clear edge while sparing as much lung as possible, because more deposits may need removing later.
Limited breathing reserve
When COPD or other lung disease means a lobe cannot be spared, the team weighs a segmentectomy, a wedge, or focused radiotherapy. Which one depends on the tumour and on how much lung the tests say you can lose.
A smaller operation chosen for this reason is a compromise the team will explain, not a shortcut.Not sure whether this applies to you?
Ask an oncologistOn the day
What happens during a sublobar operation?
Finding the nodule
A small nodule deep in soft lung can be hard to feel. Some centres mark it beforehand with a tiny wire, a dye or a marker placed under CT guidance, so the surgeon can find it quickly.
Reaching the lung
Almost always by keyhole, through two or three small cuts, with the lung on that side rested. An open cut is used only if the position or scarring demands it.
Removing the piece
For a wedge, a stapler cuts and seals the lung on either side of the nodule in one motion. For a segmentectomy, the surgeon first follows and seals the segment's artery, vein and airway, then divides the lung along the segment boundary.
Checking and closing
The piece often goes straight to the pathologist for a quick look while you are asleep. A chest drain is placed and the cuts are closed. Most people are walking the next morning.
On your report
Words you will meet on the surgery and pathology reports
- Sublobar
- Any operation that removes less than a whole lobe. It covers both segmentectomy and wedge resection.
- Anatomical
- An operation that follows the lung's natural units and their vessels. A segmentectomy is anatomical; a wedge is not.
- Margin
- The rim of healthy lung between the tumour and the stapled edge. A clear margin means no cancer cells reached the edge.
- Frozen section
- A quick examination of the removed tissue while you are still asleep, used to confirm cancer or check the edge before the surgeon decides whether to do more.
- Ground-glass nodule
- A hazy spot on CT rather than a solid lump. These often grow slowly and are one of the situations where a smaller operation is considered.
Commonly believed
Three things families tell us, and what is actually true
"A smaller operation means the cancer is less serious."
Not necessarily. A sublobar operation is often chosen because of your breathing reserve or the nodule's position, not because the cancer is milder. The stage is set by the pathology report afterwards, and that is what guides any further treatment.
"A wedge is just a biopsy, so there is nothing to follow up."
If the wedge turned out to contain cancer, it was treatment, and it needs the same follow-up scans as any other lung operation. Because a wedge takes no glands, your team may also discuss whether more should be done.
"Keeping more lung always means better breathing afterwards."
Usually, but not always by as much as people expect. A segment that was already scarred or poorly working adds little, and a cancer left behind costs far more. The breathing tests are what tell the team how much the saved tissue is really worth.
Being straight with you
What this page cannot tell you
It cannot tell you whether a segmentectomy, a wedge or a lobectomy is right for you. That decision rests on the size and position of the nodule, on your breathing tests and on what the surgeon finds during the operation. It also carries no prognosis, which means the likely course of the illness.
Questions worth asking your surgeon
Ask why a smaller operation rather than a lobectomy, and whether that is because of the tumour or because of your lungs. Ask whether the glands will be sampled. Ask what happens if the quick examination during surgery shows cancer or a close edge, and whether you are agreeing now to a larger operation in that case.
If the answer is a wedge for a diagnosis
Ask what the plan is for each possible result, so there are no surprises at the follow-up visit. Bring the family member who will help you decide, and bring your questions written down.
If you have a report you do not understand, call the helpline and someone will read it with you.Questions we are asked
Common questions about segmentectomy and wedge resection
Is a wedge resection a proper cancer operation?
It can be, in the right situation: a very small nodule near the edge, a deposit from another cancer, or a person whose lungs cannot spare more. For most lung cancers that need surgery, the team prefers a segmentectomy or a lobectomy, because those take the glands and a wider rim. Ask which applies to you.
Why did the surgeon take more than planned?
Usually because the quick examination during surgery showed cancer, or a cut edge too close to it, and going on to a segmentectomy or lobectomy in the same sitting spares you a second operation. This possibility should be discussed and agreed with you beforehand, so ask about it at consent.
Will I recover faster than after a lobectomy?
Often a little faster, mainly because less lung surface has been cut and air leaks tend to settle sooner. The difference is smaller than people expect. The cuts, the drain and the breathing exercises are the same, and most of the recovery time is about the chest wall healing rather than the amount of lung removed.
Will I be breathless afterwards?
Less than after a lobectomy, because more lung is kept. In the first weeks you may still notice stairs. If a sublobar operation was chosen because your reserve was already limited, the team will have planned for what you will be left with and will tell you what to expect.
What if the nodule turns out not to be cancer?
Then the operation has given you a definite answer, which is exactly what it was for. Old infection, TB scars and harmless growths are common findings. You will still have the recovery of a small lung operation, but no cancer treatment and usually no long-term follow-up for that nodule.
Do I still need follow-up scans after a small operation?
Yes, if the piece removed contained cancer. Follow-up scans after a sublobar operation are at least as important as after a lobectomy, because less surrounding lung and fewer glands were removed. Your oncologist will set the schedule at the pathology appointment.
Can this be done by keyhole surgery?
Almost always. Both operations suit keyhole surgery well, because the nodule is usually near the edge of the lung. An open cut is used only when scarring, position or bleeding makes it safer. Ask your centre which approach is planned and what would make them switch during the operation.
Is it covered by Aarogyasri or my insurance?
Usually yes, when it is part of an approved cancer treatment plan. Aarogyasri, CGHS, ECHS and EHS are accepted at CION, and most cashless insurers are empanelled. Cover for keyhole charges varies between schemes, so call the helpline with your card details and we will check before you travel.
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Sources
- Cancer Research UK — Surgery for lung cancer
- American Cancer Society — Surgery for Non-Small Cell Lung Cancer
- National Cancer Institute — Non-Small Cell Lung Cancer Treatment (PDQ) - Patient Version
- NICE — Lung cancer: diagnosis and management (NG122)
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
Lobectomy vs Sublobar Resection: Which and WhyHow the team weighs a whole lobe against a smaller operationLobectomy: What the Operation InvolvesThe larger operation these are compared againstSurgery for Lung Metastases From Another CancerThe commonest reason for a wedgeLung Function Tests Before Lung SurgeryThe tests that decide how much lung you can spareThe Pathology Report After SurgeryWhat margin and frozen section mean on your report
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Been offered a segmentectomy or a wedge, and not sure why?
Send us your CT report, or call the helpline. A surgical oncologist will explain what is planned and what the alternatives would mean. One helpline serves every CION centre.