Breast surgery that keeps the breast

The tumour is taken out with a rim of normal tissue around it and the rest of the breast stays — the right operation for some tumours and not for others.

A surgeon in navy scrubs fitting magnifying loupes over his mask before an operation, a colleague standing to his right.

What it is

Breast-conserving surgery removes the tumour together with a rim of normal tissue all the way around it, and leaves the rest of the breast in place. You may hear the same operation called a lumpectomy or a wide local excision. Radiation to the remaining breast is almost always part of the plan afterwards, so it is better understood as one treatment in two parts than as an operation on its own. It is not a smaller version of a mastectomy and it is not a better one: it is the right operation for some tumours and the wrong one for others. Which of the two you are offered comes off the scan and the pathology report — the size and position of the tumour, how far it extends inside the breast, the size of the breast itself, and what the tissue tests show. The armpit is dealt with in the same operation, because whether the lymph nodes are involved changes the rest of your treatment. Where both operations are genuinely possible in your case, your surgeon goes through both of them with you before you sign anything.

What happens, step by step

Two surgeons in gowns and masks, one wearing loupes, working together over a draped patient.

Before a date is fixed, the scans and the report decide the operation.
The choice between keeping the breast and removing it is made from the mammogram, the ultrasound, sometimes an MRI, and the biopsy report — not from how the lump feels in the clinic. Your surgeon is working out whether the tumour can be taken out with normal tissue all around it and still leave a breast that looks like a breast. Sometimes the answer is that chemotherapy or hormone tablets are given first to shrink it, and the operation is planned again after that. Sometimes the answer is that conservation is not right in your case, and you should be told that plainly, with the reason.
The pre-operative visit.
A few days before, you come in for blood tests, an ECG and sometimes a chest X-ray, and you meet the anaesthetist. Bring every medicine you take, in the strip, including the ones you buy yourself: blood thinners and some diabetes medicines have to be stopped or changed first, and only the doctor with the whole list in front of them can say which and from when. You are told when to stop eating and drinking, what time to come, what the admission will cost, and what the consent form covers. Ask about anything on it you did not follow. Signing it is not a formality.
Marking the lump on the morning, if it cannot be felt.
Some tumours can be seen on a scan but not felt by hand — usually the small ones, found early. For those, a radiologist marks the spot before you go to theatre, with an ultrasound or a mammogram showing the way, using a fine wire or a small marker placed under local anaesthetic. It stings for a moment and after that it is awkward rather than painful. The side being operated on is checked out loud with you more than once, and that repetition is deliberate.
The operation: the tumour, and the margin around it.
You are asleep under a general anaesthetic. The tumour is removed together with a rim of normal tissue all around it — that rim is the margin, and it is the point of the operation. The piece that comes out is marked up so the laboratory can tell which surface faced which direction inside the breast, and it is often X-rayed then and there to confirm the marked area is inside it. The remaining breast tissue is brought together to keep the shape as far as the amount removed allows, and closed with stitches under the skin that usually dissolve on their own.
The first node the breast drains into: the sentinel node.
Fluid from the breast drains to the lymph nodes in the armpit, and reaches one or two of them before the rest. Those are the sentinel nodes. Finding them and testing them means the whole armpit does not have to be cleared, and clearing the whole armpit is the part of this surgery that most affects the arm and shoulder afterwards. To find them, a tracer is put into the breast shortly before or during the operation and followed to the node it reaches; you may hear the step called a sentinel lymph node biopsy, or SLNB. The mapping is done with, and you will be told which method is being used in your case beforehand: blue dye stains the skin where it went in for some weeks and can colour the urine for a day, a radiotracer does neither, and a fluorescence camera shows the tracer as light on a screen. Where the nodes are already known to be involved, this step is not done and more of the armpit is cleared instead.
Waking up, the ward, and the drain.
You wake in the recovery room with a dressing over the breast and a tight, heavy, sore feeling rather than a sharp pain; a sore throat from the breathing tube is common and passes by the next day. There may be a thin drain running from the wound into a bottle to carry away fluid — more unpleasant to look at than to have. Painkillers are given on a schedule rather than only when you ask for them, and taking them and moving is better than lying still and being brave about it. one to three days is the usual stay. Before you go home you are shown how to look after the dressing, when you may shower, and the first arm exercises.
The arm exercises, and the first weeks at home.
Start the shoulder exercises on the day you are told to, not when the soreness settles. This is the one part of the recovery entirely in your hands, and it is what decides how the shoulder ends up. Use the arm for ordinary things — eating, dressing, combing your hair — and keep it away from heavy lifting and heavy housework for the first few weeks. Numbness in the skin of the upper inner arm is expected if the armpit was operated on, and it often stays. If a soft swelling collects under the wound after the drain comes out, that is a seroma: common, not an infection, and drained with a needle in the clinic if it is uncomfortable.
The pathology report, and what follows it.
Everything removed goes to the laboratory — the tumour, to measure the margin on every surface, and the nodes, to see whether any cancer reached them. 24 to 48 hours for the report. If cancer cells reach the edge of the piece that was removed, a second operation is done to take a little more tissue from that side; that is a judgement made from the report rather than a mistake in the first operation, and it is one of the things you are told about before you consent. If the nodes are involved, more surgery to the armpit or radiation to it may be added. Your case then goes back to the tumour board with the report in front of it, radiation to the remaining breast is planned, and whether chemotherapy, hormone tablets or HER2-directed treatment belong in your plan is decided there.

How long, and how often

The pre-operative tests are done a few days before, on a separate visit. You are usually admitted on the morning of the operation, or the evening before if you are travelling from a distance. How long the operation itself takes depends on the size of the tumour, whether the lump had to be marked first, and what is done to the armpit — ask your surgeon what to expect in your case rather than working from a number you heard from somebody else. one to three days is the usual stay. If a drain was left, it comes out once the fluid coming through it has settled, which may be before you go home or at a visit a few days later. The wound is checked in the clinic in the first week or so. 24 to 48 hours for the pathology report, and the plan for what comes next is made once it is in hand. Most people are doing ordinary things at home within a week or two and are back to light work in two to three weeks; heavy work, and anything that means lifting with that arm, takes longer, and your surgeon will tell you when. Radiation, when it is part of the plan, starts some weeks after the operation once the wound has healed, and runs as short daily sessions over some weeks. If hormone tablets are part of the plan they carry on for years. Put together, the surgery is a matter of weeks. The treatment it belongs to is longer than that, and knowing the shape of it in advance makes it easier to arrange your life around.

Side effects, and the support that comes with them

Expect the breast to be sore, tight and swollen for a couple of weeks, with bruising that spreads and changes colour before it fades. The scar is red or dark at first and settles over months. The breast on that side ends up a little smaller and firmer than the other one, and the difference is greater the more tissue had to be removed. Sensation over the scar and, if the armpit was operated on, in the skin of the upper inner arm is often reduced, and that can be permanent. The shoulder is stiff for a while. A tight cord you can feel running from the armpit down the inner arm is called cording; it is not dangerous, it eases with the exercises and with stretching, and it is worth telling the physiotherapist about. Fluid collecting under the wound — a seroma — is common and is drained in the clinic if it needs it. Because lymph nodes have been removed, the arm on that side carries a risk of swelling, called lymphoedema, which can appear months or years later: tell your doctor the first time you notice the arm, hand or fingers feeling tight, whenever that is. If blue dye was used to find the sentinel node, the skin where it went in stays stained for some weeks and the urine can change colour for a day. Tiredness for a few weeks is ordinary, and it takes more out of most people than they expect for an operation this size. The first time you look at the wound is harder than the operation for many people: have somebody with you when you do it, and ask the nurse to be there the first time if that is easier.

Call us the same day if bleeding through the dressing does not stop with firm pressure held over it, if you develop a fever or shivering, or if the wound becomes hot, red or swollen, starts to discharge, or opens. Call the same day too if the breast swells quickly and feels tight rather than settling day by day, if the pain is increasing instead of easing and the painkillers you were given are not touching it, if the arm on that side swells suddenly, or if a rash, itching or swelling of the face follows the dye used for the sentinel node. Breathlessness, chest pain, or a calf that becomes painful, swollen and warm means a hospital the same day rather than a wait. None of these is common. All of them are worth a phone call rather than a wait until the follow-up visit.

What we use

The operation is done in the theatre of the hospital where your surgeon operates, with that hospital's equipment. What changes the outcome of the day is not the badge on the camera — it is whether the tumour was suited to this operation in the first place, whether the margin was taken on every surface, and whether the pathology report was read carefully. Sentinel node mapping is done with. There are three ways it is done and all three answer the same question: a blue dye that the surgeon follows by eye; a radiotracer, injected earlier in the day, that is followed with a probe; or a fluorescent dye called ICG, indocyanine green, which glows on a screen under a particular light. Ask which one is being used for you, and if it is the blue dye, ask about the staining beforehand rather than discovering it afterwards. Where the lump was marked before the operation, the piece removed is usually X-rayed in theatre to confirm the marked area is inside it. Reports come back in 24 to 48 hours. Your films, slides and reports belong to you: ask for them back, keep them together, and bring them to every appointment, including the ones from before the operation.

Questions we hear every week

Is keeping the breast less safe than removing it?

That is not how the choice is made. Where a tumour suits it, removing it with a clear margin and then treating the remaining breast with radiation is an accepted standard operation, and it is offered on that basis and no other. Where a tumour does not suit it — its size, its position, how far it extends inside the breast, or the size of the breast itself — conservation is not offered, and that is not a matter of preference. Ask which applies in your case and why. You are entitled to the reason, not only the recommendation.

Why do I need radiation if the whole lump has been removed?

Because the operation and the radiation are two halves of one treatment, not a treatment and an extra. The surgery takes out the tumour with a margin; the radiation treats the breast tissue that has been left behind, which is why it is almost always part of the plan after this operation. If radiation would not be possible for you — because of another condition, the distance, or a previous course of it — say so early, because it can change which operation is the right one.

What is the sentinel node, and what happens if there is cancer in it?

It is the first node in the armpit that fluid from the breast drains into. Taking it and testing it is a way of asking whether the cancer has reached the nodes without clearing the whole armpit, which is the part of the operation that most affects the arm and shoulder. If cancer is found in it, more of the armpit may be cleared, or radiation may be given to the armpit instead. That decision is made from the report and discussed with you, not decided quietly.

Why might I need a second operation?

Because the laboratory measures the margin on every surface of the piece that was removed, and sometimes cancer cells reach the edge on one of them. Then a little more tissue is taken from that side. It is a judgement made from the report and not an error in the first operation, and it does not mean the disease has changed or worsened. It is why this possibility is explained to you before you consent rather than after.

Will the breast look the same afterwards?

Not the same, no. It will usually be a little smaller and firmer on that side, with a scar that fades over months, and the nipple may sit slightly differently. How much difference there is depends on how much tissue had to be removed and how large the breast was to begin with. Ask your surgeon before the operation where the scar will be and roughly what the difference will look like, and ask what can be done about it afterwards if it bothers you. Most people find it is noticeable to them and not to other people — but nobody should be told what they will feel about their own body.

Have a report or a symptom you are unsure about?

Bring it in. If it is nothing, we will tell you it is nothing.

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Medically reviewed by The surgical oncology team, Saurashtra Cancer Care, MCh / DNB Surgical Oncology · August 2026