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Re-excision when the margins are positive | CION Cancer Clinics
A re-excision is a second, usually smaller operation to remove more tissue when the laboratory finds cancer cells at the edge of what was taken out, called a positive margin. It lowers the chance of the cancer growing back in the same place. A positive margin does not mean the first surgery failed or that the cancer has spread. This page explains the report, the options and what to ask. 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
- Why would you need a second operation after a wide excision?
- What do the margin words on your report mean?
- What can be done about a positive margin?
- What does a re-excision involve?
- What do families often fear about a positive margin?
- What can you expect, and what should you ask?
- Common questions about re-excision
The short answer
Why would you need a second operation after a wide excision?
A re-excision is a second, usually smaller operation to remove more skin where the laboratory found cancer cells at, or very near, the edge of what was taken out. It is done to lower the chance of the cancer growing back in the same place, and it is a common, planned next step.
What a "positive margin" means
After surgery, the removed tissue is examined under the microscope. The pathologist, the doctor who reads the tissue, inks the outer edge and checks whether cancer cells touch that ink. The rim of normal tissue around the cancer is called the margin. If cells reach the edge, the margin is called positive or involved. It means some cancer cells may still be in the wound bed.
It does not mean the surgery failed
Skin cancers often spread under the surface in ways nobody can see or feel. A surgeon can plan the right margin and still find, days later, that cells reached further than expected. The report is how that gets caught. That is why the edges are checked at all.
This page explains the usual options. It cannot tell you which one your team will recommend, or what your report means for your outlook.On your report
What do the margin words on your report mean?
- Involved or positive margin
- Cancer cells reach the inked edge of the removed tissue.
- Close margin
- Cells do not touch the edge but come very near it. Whether that needs more surgery depends on the cancer type.
- Clear or negative margin
- A rim of normal tissue sits between the cancer and the edge everywhere that was checked.
- Peripheral or lateral margin
- The side edges, around the skin surface.
- Deep margin
- The bottom edge, under the cancer. A positive deep margin may mean removing a deeper layer.
- Residual tumour
- Cancer found in the re-excision tissue. Its absence is common and reassuring, but it is not a promise.
Not sure whether this applies to you?
Ask an oncologistThe options
What can be done about a positive margin?
Re-excision is the most common answer, but not the only one. The choice depends on the cancer type, where it is and your health.
Re-excision
The old scar and a further rim of tissue around it are removed, and the new tissue is checked again.
Usually considered for
- Melanoma with an involved edge
- Most squamous cell cancers
- Soft tissue sarcomas
Mohs or edge-checked surgery
On the face, a layer-by-layer method may be used so only the involved area is taken. Ask whether it is available and suitable for your cancer.
Radiotherapy
For some cancers, or for people where further surgery is difficult, radiotherapy to the area may be discussed instead of, or after, more surgery.
Careful follow-up
For some small basal cell cancers with an involved edge, especially in frail or elderly people, the team may suggest regular checks instead. This is not suitable for most other cancers.
The second operation
What does a re-excision involve?
Reviewing the report
Your surgeon explains which edge was involved, and your case may be discussed by the wider team. Bring every report, including the first biopsy, to this visit.
Planning the new margin
The surgeon marks the old scar and the extra rim needed. If the deep edge was involved, the plan may go into the fat or muscle layer below.
The operation
Often shorter than the first and frequently under local anaesthetic, though a larger or deeper re-excision may need general anaesthesia or a graft or flap to close.
The second report
The new tissue goes to the laboratory. You return for the result, and the team explains whether anything further is needed.
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Commonly believed
What do families often fear about a positive margin?
"The surgeon made a mistake, so we should go somewhere else."
An involved margin happens to careful surgeons too, because cancer can spread under the skin where it cannot be seen. A second opinion is always your right, but changing centres can delay the operation you need.
"A positive margin means the cancer has spread through the body."
It is about the edge of one piece of tissue. It says nothing on its own about the lymph nodes or other organs, which are assessed separately.
"Since most of it is out, we can wait and see."
For most cancers, leaving known cancer cells in the wound raises the chance of it growing back, often deeper and harder to remove. Waiting is only a choice when your team has explained why it suits your situation.
"A second operation will make the cancer spread."
Surgery to remove remaining cancer cells does not spread them. The greater risk comes from leaving them in place.
Being straight with you
What can you expect, and what should you ask?
A re-excision leaves a longer scar than the first operation, because the old scar and more tissue come out together. On the face, hands or near a joint, closing it may need a graft or flap. Ask how the wound will be closed before you agree to the plan.
How soon should it happen?
Re-excision is usually planned once the first wound has settled, and should not be put off for months. Ask your surgeon how soon they want to operate and why. If money, travel or family duties are holding you back, tell the team so they can help plan around it.
Questions worth asking
Which edge was involved, the side or the deep one? Is more surgery the usual step for this cancer type, or are there other options? Will the new tissue be checked the same way? What happens if the second report is also positive?
What the second report may show
Often, no further cancer is found in the extra tissue. Sometimes a small amount is. Either way, the team uses the result to plan follow-up or any further treatment.
When a second operation may not be the plan
A re-excision may not suit someone who is very unwell, someone whose cancer has already spread elsewhere, or a place where more surgery would badly affect how a limb or the face works. In those cases, the team may talk about radiotherapy, other treatment or closer follow-up. The decision belongs to you and your treating team together, not to this page.
Did you know
Pathologists paint the outer surface of the removed tissue with ink before slicing it. That ink is how they can tell, under the microscope, exactly where the edge of your operation was.
Questions we are asked
Common questions about re-excision
Is a close margin the same as a positive margin?
No. A positive margin means cancer cells reach the edge. A close margin means they come near it without touching. Whether a close margin needs more surgery depends on the cancer type and the guideline your team follows. Ask your surgeon to explain what your report says and what they recommend.
Will the second operation be as big as the first?
Often it is smaller, especially if only a narrow rim is needed. It can be bigger if the deep edge was involved or the first wound was closed with a flap. Your surgeon will explain the expected size and how the wound will be closed.
Is re-excision covered by Aarogyasri or insurance?
Further surgery for the same cancer is often covered, but rules differ between schemes and policies. Aarogyasri, CGHS, ECHS, EHS and most cashless insurers cover cancer surgery. Check with your scheme office or insurer before the date, with the pathology report in hand.
What if the margin is positive again?
It happens occasionally, especially with cancers that spread in an irregular way under the skin. The team may suggest another excision, a layer-by-layer method, radiotherapy, or a discussion at a tumour board. Ask them to explain the reasons for each option.
Can my father avoid a second operation because of his age?
Age alone is not the deciding factor. The team weighs the cancer type, his overall health, other illnesses and what he wants. For some small cancers careful follow-up may be reasonable, and for others it is not. Ask the team to talk it through with him and the family.
Should I get a second opinion on the pathology?
You can ask for the slides and tissue block to be reviewed by another pathologist, and this is sometimes done anyway. Ask your centre how to request it. Keep the original reports and slides safe, as they are needed for any future treatment.
Will I need more tests before the re-excision?
Not always. For a small skin cancer, the operation may go ahead with routine checks. For melanoma or sarcoma, the team may want scans or a lymph node assessment first. Ask what is needed and why before the date is fixed.
Does a positive margin change my follow-up?
It may. Even after a clear re-excision, the team may suggest closer skin checks of the area for a period. Learn what the scar should look and feel like, and report any new lump, spot or change in or around it.
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
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Dr. Vajja Sandeep Kumar
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Sources
- National Cancer Institute — Surgical margin - NCI Dictionary of Cancer Terms
- Cancer Research UK — Surgery for melanoma skin cancer
- American Cancer Society — Surgery for Basal and Squamous Cell Skin Cancers
- NICE — Melanoma: assessment and management (NG14)
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 TypeWhy each cancer type has its own marginThe Pathology Report After SurgeryReading the rest of the reportMohs Surgery: Is It Available in India?The layer-by-layer option for the faceFollow-Up and Skin Surveillance After ExcisionChecks after the second operation
Talk to us
Report says the margin is involved?
Send us the pathology report or call the helpline. A surgical oncologist will explain what it says and which options are usually considered. One helpline serves every CION centre.