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Wide local excision: what it means | CION Cancer Clinics
A wide local excision is an operation that removes a cancer together with a rim of healthy-looking tissue all around it, called the margin. It is used for melanoma, other skin cancers, breast lumps and soft tissue sarcomas. Most skin excisions are day-case procedures. This page explains what the words mean, what happens on the day, and what the pathology report will say afterwards. 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 does "wide local excision" actually mean?
- Which cancers is a wide local excision used for?
- What actually happens during a wide local excision?
- Words you will see on the pathology report, in plain language
- Who is it not right for, and what this page cannot tell you
- Four things families tell us, and what is actually true
- Common questions about wide local excision
The short answer
What does "wide local excision" actually mean?
A wide local excision is an operation that cuts out a cancer together with a rim of healthy-looking tissue all the way around it. That rim is called the margin. "Wide" means the surgeon deliberately takes more than the lump itself, so that any cancer cells hiding just beyond its edge come out too.
Why take healthy tissue as well?
Cancer does not always stop where it looks like it stops. Under the microscope, cells can be found a little way past the visible edge. Cut along that edge and some cells stay behind, so the cancer can grow back in the same place. A planned rim of normal tissue reduces that chance. How much is taken depends on the type of cancer, how deep it goes, and where on the body it sits.
Where the name comes from
"Local" means the operation deals with the one spot where the cancer is, not the whole organ and not the lymph nodes, the small glands that drain the area. "Excision" means cutting out. You will also see it written as WLE, or as "wide excision". They all mean the same thing.
An "excision biopsy" is a smaller step: the lump was removed to find out what it is, without a planned margin.Where it is used
Which cancers is a wide local excision used for?
The same operation goes by the same name in several parts of the body. What changes is the size of the margin and how the wound is closed.
Melanoma
The most common reason for the operation. After a mole has been removed and found to be melanoma, a second operation takes out the scar and a wider rim of skin. The rim is set by how deep the melanoma went.
Other skin cancers
Basal cell and squamous cell cancers are usually treated with a single wide excision, often under a local anaesthetic, with a smaller margin than melanoma needs.
Often done as
- A day-case procedure
- One visit for removal, one for the result
Breast
In breast cancer the same operation is usually called a lumpectomy or breast-conserving surgery. The lump comes out with a margin and the rest of the breast stays. Radiotherapy usually follows.
Soft tissue sarcoma
Cancers of muscle, fat and connective tissue are removed with a cuff of normal tissue in every direction. This is the largest version of the operation and is planned from an MRI scan.
Ask your centre how often they operate on sarcoma. It should be regularly.Not sure whether this applies to you?
Ask an oncologistOn the day
What actually happens during a wide local excision?
Marking the margin
Before anything is numbed, the surgeon draws on your skin. First the edge of the cancer or the old scar, then a second line the planned distance outside it. You can ask to see this and ask why that distance was chosen.
Numbing or sleeping
Small excisions on the skin are done under a local anaesthetic, so you are awake and feel pushing but not pain. Larger ones, or ones that need a lymph node check at the same time, are done under a general anaesthetic.
Removing the tissue
The surgeon cuts along the outer line and removes the whole piece, including the fat underneath it down to a set depth. The piece is marked with stitches or ink so the laboratory knows which edge is which.
Closing the wound
Most wounds are closed edge to edge with stitches. A wider or tighter area may need a skin graft, a thin sheet of skin from elsewhere, or a flap, where nearby skin is moved across to cover the gap.
On your report
Words you will see on the pathology report, in plain language
- Margin
- The rim of normal tissue around the cancer. The report measures how far the nearest cancer cell sat from the cut edge.
- Clear or negative margin
- No cancer cells were found at the edge of what was removed. This is the result the operation is aiming for.
- Close margin
- Cancer cells were not at the edge, but sat very near it. Your team decides whether that is enough for this cancer type.
- Involved or positive margin
- Cancer cells reach the cut edge. A second operation, called a re-excision, or radiotherapy is usually discussed.
- Deep margin
- The underside of the piece removed, not the sides. It matters as much as the edges, and the surgeon cannot see it while operating.
- Completely excised
- The laboratory's way of saying the whole cancer appears to have come out with a margin around it.
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After you go home: what should not wait
Bleeding that soaks through the dressing and does not stop with firm pressure, spreading redness or heat around the wound, pus, a bad smell, or a fever in the days after the operation all need a call to your surgical team the same day. At night, go to the nearest emergency department and say you have had cancer surgery. Do not pull the dressing off to look, and do not start antibiotics from a chemist on your own.
Being straight with you
Who is it not right for, and what this page cannot tell you
A wide local excision suits a cancer that is in one place and can be taken out with a rim of normal tissue without damaging something important next to it. It is not right for every situation.
When another approach is chosen
On the face, the eyelid, the nose or the fingers there may not be enough spare skin for a wide margin, so a technique that checks the edges under the microscope during the operation, or radiotherapy, may be offered instead. If the cancer has already spread to lymph nodes or elsewhere, the plan is built around treating the whole body.
What this page cannot tell you
It cannot tell you how big your own margin should be, whether you should have the operation, or what your outlook is. Those answers come from your biopsy report, your scans and your treating team. Bring the report, bring the family member who helps you decide, and ask the surgeon to draw the planned margin for you.
If the appointment is still days away, call the helpline. Someone will read the report with you.Commonly believed
Four things families tell us, and what is actually true
"The mole was already removed, so why a second operation?"
The first removal was a test. It took the mole out with a tiny edge so the laboratory could say what it was. Now that the answer is known, the second operation takes the planned margin the diagnosis calls for.
"Cutting a cancer makes it spread."
Removing a cancer with a margin is the treatment, not a risk. The surgeon handles the tissue so that cells are not spilt, and the whole piece leaves the body in one go. Delay is what gives a cancer time to grow.
"A bigger margin is always safer, so ask for the widest."
Beyond the size the evidence supports for that cancer, a wider margin does not add protection. It adds a larger wound, a higher chance of needing a graft, and a bigger scar.
"If the margin is clear, I need no follow-up."
A clear margin is good news about that spot. It does not remove the need for check-ups, because some cancers can appear elsewhere on the skin or in the same area later. Your team will set how often you are seen.
Questions we are asked
Common questions about wide local excision
Is a wide local excision a big operation?
Usually not. For most skin cancers it is done under a local anaesthetic and you go home the same day with a dressing. It becomes larger when a graft or flap is needed, or when lymph nodes are checked at the same time under a general anaesthetic.
Will I be awake?
For a small excision on the skin, yes. The area is numbed with an injection, which stings for a moment, and after that you feel pressure but not pain. If a general anaesthetic is planned, the anaesthetist will see you beforehand. Tell them about every medicine you take, including blood thinners.
How long does the operation take?
A simple skin excision with direct stitching is often finished within the hour, including the numbing and the dressing. One that needs a graft, a flap or a lymph node biopsy takes longer. Your surgeon will give you a time for your own case.
How big will the scar be?
Longer than the lump, because the surgeon cuts an oval so the skin closes flat, and that oval is roughly three times as long as it is wide. The scar fades over many months. Where it sits and how you heal matter more than the stitching.
What if the report says the margin is not clear?
It means cancer cells were found at or very near the cut edge. The team will discuss a second, smaller operation to take a little more, or sometimes radiotherapy instead. It is common and not a sign that anything went wrong. Ask which edge was involved.
When will I get the pathology result?
The piece removed is cut, stained and read under a microscope. That usually takes around a week, longer if extra stains are needed. Your follow-up appointment is timed so the result is ready. If it is delayed, call the helpline and we will find out where it stands.
Is a wide local excision the same as a lumpectomy?
In the breast, yes. Lumpectomy, wide local excision and breast-conserving surgery describe the same operation: the lump with a margin, leaving the rest of the breast. Outside the breast the word lumpectomy is not used, but the idea is identical.
Is it covered by Aarogyasri or my insurance?
Cancer surgery is generally 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 card details and we will check your cover.
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
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Sources
- National Cancer Institute — Wide local excision (NCI Dictionary of Cancer Terms)
- Cancer Research UK — Surgery for melanoma skin cancer
- NHS — Melanoma skin cancer
- Macmillan Cancer Support — Melanoma
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
How Wide Is 'Wide'? Margins by Cancer TypeThe typical margin for each cancer and why it differsClosing the Defect: Direct Closure, Graft or FlapHow the wound is closed once the margin is takenRe-Excision When Margins Are PositiveWhat happens if the report says the edge is involvedThe Pathology Report After SurgeryReading the report line by lineWound, Stitches and ScarsLooking after the wound at home
Talk to us
Been told you need a wide excision?
Send us the biopsy report or call the helpline. A surgical oncologist will explain what margin is being planned and why, and help you reach the right team. One helpline serves every CION centre.