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CION Cancer Clinics
Re-excision after a positive margin: what the second operation involves | CION Cancer Clinics
A re-excision is a second, smaller operation after a lumpectomy. It removes a thin extra layer of tissue from the edge where the pathologist found cancer cells, usually through the same scar. It is planned for in every breast unit and does not mean the first operation went wrong. This page explains what happens, what the alternatives are, and what to ask before you agree. 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 a re-excision after lumpectomy?
- What actually happens in a re-excision?
- The first lumpectomy and the re-excision, compared
- Is re-excision the only option after a positive margin?
- Three things families tell us, and what is actually true
- What this page cannot tell you
- Common questions about re-excision
The short answer
What is a re-excision after lumpectomy?
A re-excision is a second, smaller operation to remove a little more breast tissue from the edge where the pathologist found cancer cells. It is done because the first piece had a positive margin, meaning cancer was at the cut edge. The surgeon usually goes back in through the same scar, takes a thin extra layer from that side of the cavity, and closes the wound again.
Why it is needed at all
The first operation removes the lump with a rim of normal tissue. That rim is checked under the microscope after you have gone home. If cells are found touching the edge, some cancer may still be in the breast. Radiotherapy alone is not relied on to deal with known cancer left behind, so the edge is widened first.
Who it is not for
It is not always the right answer. If the involved edge lies against the chest muscle or right under the skin, there may be no more tissue to take from that side. If cancer sits at several edges, one more lumpectomy may not clear it, and the team may talk about a mastectomy instead. Your surgeon will explain which situation is yours.
A re-excision does not restart your treatment or change your stage. It is a step inside the same plan.The second operation
What actually happens in a re-excision?
Before the day
Your surgeon reviews the pathology report and the marked slides to see exactly which face of the piece was involved. Usually no new scan is needed. You have the same fitness checks as before, often shorter because they were done recently.
In the theatre
You are asleep under a general anaesthetic. The surgeon reopens the first scar, finds the cavity, and removes a thin layer of tissue from the wall that was involved. The new piece is marked so the laboratory knows which side is which.
Closing and going home
The tissue is shaped and the skin closed, usually with dissolving stitches. Most people go home the same day or the next morning. A drain is rarely needed for this smaller operation.
The second report
The new piece is inked, sliced and checked in the same way as the first. If the edge is now clear, you move on to radiotherapy. If it is not, the tumour board meets again to talk through the next option with you.
Not sure whether this applies to you?
Ask an oncologistSide by side
The first lumpectomy and the re-excision, compared
First lumpectomy
Re-excision
Removes the tumour and a rim around it
Removes a thin layer from one or two cavity walls
Often includes a lymph node check under the arm
Lymph nodes are not usually touched again
May need a wire or seed to find the lump
The surgeon follows the existing scar and cavity
A new scar
Usually the same scar, reopened
Recovery of a couple of weeks for most
Usually quicker, with less bruising
What the team weighs
Is re-excision the only option after a positive margin?
No. The tumour board looks at which edge, how much cancer was there and what type, and picks from three routes.
Widen the edge
The usual choice when there is breast tissue left to take on that side and the rest of the breast looks clear on the scans. It keeps the breast and keeps the original plan.
Usually chosen when
- One or two edges are involved
- The breast can spare a little more
- The scans show no other disease
Radiotherapy with an extra dose
Where the involved edge sits on the chest muscle or under the skin, there is nothing more to remove. The radiation oncologist may instead add a boost to the area where the tumour was. This is a decision for the board, not a shortcut.
Mastectomy
When cancer is at several edges, or a second re-excision is still involved, the disease is usually more spread through the breast than any scan showed. Removing the whole breast is then discussed with you, along with rebuilding it.
This is uncommon, and it is a conversation. Ask about reconstruction at the same time.Leave a number, we will call you
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Commonly believed
Three things families tell us, and what is actually true
"A second operation means the first surgeon made a mistake."
The edge of a breast cancer is often invisible to the eye and the fingers. Only the microscope can see it, days later. Re-excision is a planned-for part of breast conserving surgery in every breast unit in the world.
"Opening the wound again will spread the cancer."
It does not. Cancer does not travel because a scar is reopened. What does raise risk is leaving known cancer at the edge and hoping radiotherapy alone will handle it, which is why the edge is widened first.
"We should just remove the whole breast and be done with it."
For a single involved edge, widening it gives the same protection as a mastectomy once radiotherapy follows. A mastectomy is a bigger operation with its own recovery. It is the right choice for some situations, not a safer default for all.
!
One thing that cannot wait after either operation
A breast that becomes suddenly swollen, tight and painful within the first day or two, or a wound that turns red, hot and starts to leak, needs to be seen the same day. The first can be bleeding into the cavity; the second an infection. Call the helpline or go to the nearest emergency department and say you have had breast surgery. Do not wait for the follow-up appointment.
Being straight with you
What this page cannot tell you
This page cannot tell you whether your own margin needs a re-excision. That depends on which edge was involved, whether it was invasive cancer or DCIS, how much was at the edge, and what the rest of your report says. Only the team with your slides and scans can weigh those. Ask them, and ask them to show you.
What it may mean for the look of the breast
Taking a further layer from the cavity makes the breast a little smaller or more dented on that side. For most women the change is modest. If the first operation already took a large piece, ask whether the surgeon can reshape the remaining tissue during the re-excision, or whether a small adjustment to the other breast later would help.
What to ask before you agree
Ask which edge is involved and how much tissue will be taken. Ask what the team would recommend if this edge is still involved afterwards. Ask whether the wait will delay radiotherapy, and whether chemotherapy, if planned, starts before or after. Bring the family member who will be with you on the day, so two people hear the answers.
Keep both pathology reports together. Radiotherapy planning uses them, and so does any second opinion.Questions we are asked
Common questions about re-excision
How soon after the first operation is the re-excision done?
Usually within a few weeks, once the first wound has settled and the report has been discussed. It is timed so that radiotherapy is not pushed back much. If chemotherapy is planned, the team decides whether the re-excision comes before it or after. Your surgeon will give you a date.
Is it as big an operation as the first one?
No. Less tissue is removed, the lymph nodes are not usually touched, and the surgeon works through the existing scar. Most people go home the same day or the next morning and feel less bruised than after the first operation.
Will I be asleep for it?
Usually yes, under a general anaesthetic, as for the first operation. Some units can do a small re-excision under local anaesthetic with sedation. Your anaesthetist decides with you, based on your health and how much tissue is being removed.
Does a re-excision delay my radiotherapy?
By a few weeks at most, and the team plans for this. Radiotherapy waits for the wound to heal and for the second report to confirm the edge is clear. If chemotherapy comes first, radiotherapy was always going to be some months away, so the delay is absorbed.
Can the tumour board decide not to re-excise?
Yes. For a close margin with invasive cancer, or an edge that cannot be widened, the board may recommend radiotherapy with an extra dose to the tumour bed instead. You should be told why, and you can ask for the reasoning in writing.
What are the chances the second piece is also involved?
Most re-excisions clear the edge. When they do not, it usually means the cancer is more spread out inside the breast than any scan could show, and the conversation turns to mastectomy. Ask your surgeon what their own unit sees rather than trusting a figure from elsewhere.
Will the breast look different after a re-excision?
A little smaller or more dented on that side, usually. The same scar is used, so there is no new mark. Ask whether the surgeon can reshape the tissue during the operation. Radiotherapy afterwards may also firm the breast slightly over the following year.
Is the second operation covered by Aarogyasri or insurance?
A re-excision is part of the same cancer treatment and is covered under Aarogyasri, CGHS, ECHS and EHS within an approved plan. Most cashless insurers are empanelled at CION. Call the helpline with your card details and we will confirm your cover before you travel.
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Dr. C. Raghavendra Reddy
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
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Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Sources
- Cancer Research UK — Breast conserving surgery (lumpectomy)
- Macmillan Cancer Support — Breast-conserving surgery
- American Cancer Society — Breast-conserving Surgery (Lumpectomy)
- NHS — Breast cancer in women - 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
Margins After LumpectomyWhat positive, close and clear mean on the reportWhen Lumpectomy Becomes Mastectomy Mid-TreatmentWhen widening an edge is not enoughWhy Radiation Is Almost Always Needed After LumpectomyHow radiotherapy and a clear margin work togetherWound, Stitches and ScarsLooking after the reopened scar at homeComplications and Red FlagsWhat needs same-day care after any operation
Talk to us
Been told you need a second operation?
Send us the pathology report or call the helpline. A surgical oncologist will explain which edge is involved, what the options are and how the timing fits your plan. One helpline serves every CION centre.