Medical Oncologist
Treatment options
Flap failure and partial necrosis: how often and what happens
A breast flap needs a steady blood supply to survive. Total loss is uncommon, but partial loss and fat necrosis can happen. This page explains the types of tissue loss, the warning signs checked after surgery, how a struggling flap can be rescued, and what your options are if it cannot.
MM
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
- How often does a breast flap fail, and what happens if it does?
- Types of flap tissue loss
- Healthy flap signs compared with warning signs
- The vocabulary, in plain language
- Honest realities about flap failure
- What happens next after flap failure
- Ways to lower your risk
- What people assume about flap failure
- Common questions about flap failure
The short answer
How often does a breast flap fail, and what happens if it does?
A flap reconstruction moves living tissue, such as skin and fat from the tummy, to rebuild the breast. For the tissue to survive, it needs a steady blood supply. In a free flap such as a DIEP flap, the surgeon cuts the small artery and vein that feed the tissue and joins them to vessels in the chest using a microscope. Flap failure means that blood supply stops working, so some or all of the tissue dies. Complete loss of the whole flap is uncommon in experienced reconstruction units, and most flaps that run into trouble do so in the first few days, which is why nurses check them so often. Partial loss is when only an edge or a small area of the flap does not survive. A related and more common problem is fat necrosis, where small areas of fat inside the flap harden into firm lumps. If a problem with the blood flow is spotted early, the surgeon can often take you back to theatre quickly, find a clot or kink, and save the flap. If the flap cannot be saved, the dead tissue is removed and the wound is allowed to heal. This is very disappointing, but it is not dangerous in itself once treated, and it does not mean you can never have a reconstruction. Other options, such as a different flap or an implant, can often be considered later once you have recovered.
Total loss is uncommon
Most free flaps survive, especially in units that perform them regularly.
The first days matter most
Blood flow problems usually show early, when rapid return to theatre can save the flap.
There are still options
A failed flap does not close the door on reconstruction.
This page gives general information only. Your surgeon can explain your own risk.Different problems
Types of flap tissue loss
Not every problem with a flap means the whole reconstruction has failed.
Total flap loss
The whole flap loses its blood supply and cannot be saved. It is removed in a further operation, and the chest is closed or left to heal before other options are discussed.
Partial flap loss
An edge or section of the flap dies while the rest survives. The dead part may be trimmed away, and the shape can often be improved later.
Smaller areas sometimes heal with dressings alone.Fat necrosis
Small pockets of fat inside the flap do not get enough blood and turn into firm lumps. These are not cancer, though they may need a scan or biopsy to be certain.
Skin edge problems
The breast skin left after mastectomy, rather than the flap itself, can darken or break down at the edges and may need dressings or minor trimming.
What raises risk
- Smoking and nicotine products
- Diabetes that is not well controlled
- High body weight
- Earlier radiotherapy to the chest
Not sure whether this applies to you?
Ask an oncologistWhat nurses look for
Healthy flap signs compared with warning signs
Check
What may signal a problem
Colour
A healthy flap looks pink; pale or white can mean poor inflow, while blue or purple can mean a blocked vein
Temperature
The flap should feel warm; a flap that turns cool compared with nearby skin needs review
Swelling
Some swelling is normal, but a flap that becomes tense and tight can mean blood is trapped
Capillary refill
Colour should return briskly after gentle pressure; very slow or very fast return is a concern
Doppler signal
A handheld device should pick up a blood flow sound; a fading or lost signal is reported at once
Words you may hear
The vocabulary, in plain language
- Free flap
- Tissue fully detached with its blood vessels and reconnected to new vessels in the chest.
- Pedicled flap
- Tissue moved while still attached to its original blood supply, as in a latissimus dorsi flap.
- Anastomosis
- The tiny join made between the flap's blood vessels and the vessels in the chest.
- Thrombosis
- A blood clot that blocks a vessel and stops blood flowing through it.
- Necrosis
- Death of tissue because it has not received enough blood.
- Salvage surgery
- An urgent return to theatre to restore blood flow and rescue a struggling flap.
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Being straight with you
Honest realities about flap failure
Knowing the realities ahead of surgery can make a setback easier to face if it happens.
Nobody can bring the risk to zero
Even with careful surgery and close monitoring, a small number of flaps fail for reasons that cannot always be found.
Rescue does not always work
Quick return to theatre saves many flaps, but not all. Timing and the cause of the blockage both matter.
Fat necrosis can cause worry later
A firm lump in a rebuilt breast can be frightening, and it may need tests to rule out cancer returning.
What this page cannot tell you
It cannot give your personal chance of flap loss. Ask your surgeon about their unit's experience and the factors that affect you.
If a flap is lost
What happens next after flap failure
If the flap cannot be saved, the team's first aim is to get you healed, comfortable and ready for your remaining cancer treatment.
Removing the tissue
The dead tissue is removed in theatre under general anaesthetic. The chest may be closed directly, or dressings may be needed while the wound heals from the base.
Keeping cancer treatment on track
Your oncology team will plan any chemotherapy, radiotherapy or hormone treatment around your healing, so that a delay is kept as short as possible.
Recovering in body and mind
Feeling grief, anger or disappointment is very normal. Counsellors and breast care nurses can support you through it.
Thinking about another reconstruction
Once healed, usually after several months, options may include a flap from the back, thigh or buttock, an implant, or choosing to stay flat. There is no rush to decide.
Before surgery
Ways to lower your risk
Some risk factors are part of your medical history, but others can be improved in the weeks before the operation.
Stop smoking completely
Nicotine narrows small blood vessels. Most surgeons ask you to stop all tobacco, including chewing tobacco and nicotine gum, for several weeks before and after surgery.
Control blood sugar
Good diabetes control before surgery helps wounds heal and lowers infection risk.
Share your full history
Tell your team about any clotting problems, previous clots, earlier tummy operations or radiotherapy.
Follow the monitoring plan
Frequent checks can disturb your sleep, but they give the best chance of spotting trouble early.
Commonly believed
What people assume about flap failure
A firm lump in a flap means the cancer is back.
Most firm lumps in a flap are fat necrosis, though any new lump should be checked.
If a flap fails, reconstruction is over for good.
Many people can have another type of reconstruction once they have healed.
Flap failure is always the surgeon's fault.
Clots can form even after technically sound surgery, and risk factors play a large part.
A flap that survives the first week is safe from every problem.
Total loss after the first days is rare, but fat necrosis and wound issues can appear later.
Questions we are asked
Common questions about flap failure
How will I know if my flap is failing?
In hospital, nurses check the colour, warmth, swelling and blood flow signal of the flap regularly. At home, tell your team straight away if the breast turns pale, blue, purple or cool, becomes very swollen and tight, or you notice a dark area of skin spreading.
When is flap failure most likely?
Problems with the blood vessel joins usually appear within the first two or three days after surgery. This is why monitoring is most frequent then. After the first week, sudden total loss becomes much less likely, although smaller wound and fat problems can still develop.
Can a failing flap be saved?
Often, yes. If a problem is spotted early, the surgeon can return you to theatre to remove a clot, redo a join or release pressure on the vessels. The sooner this happens, the better the chance of rescuing the tissue, which is why quick reporting matters.
Is fat necrosis dangerous?
Fat necrosis is not dangerous and is not cancer. It can feel like a firm lump and may be tender. An ultrasound or sometimes a biopsy can confirm what it is. Small areas often soften over time, while larger or painful areas can be removed if they bother you.
Will flap failure delay my cancer treatment?
It can cause some delay while the wound heals, particularly if you need chemotherapy or radiotherapy after surgery. Your surgical and oncology teams work together to restart treatment as soon as it is safe. Ask them how your plan may change.
Can I try reconstruction again?
Many people can. Options may include a flap from the back, inner thigh or buttock, an implant, or a combination. Surgeons usually wait until the chest has fully healed and any radiotherapy is complete. Some people decide to stay flat, which is also a valid choice.
Does partial flap loss ruin the result?
Not necessarily. After the dead area is removed, the breast may be smaller or uneven, but the shape can often be improved later with fat grafting, adjustment of the other breast or a small revision operation. Your surgeon can explain what is realistic for you.
Are some flaps safer than others?
Pedicled flaps, which keep their original blood supply, do not rely on tiny vessel joins, so total loss is less common. Free flaps such as DIEP flaps give a more natural result with less muscle damage but depend on those joins. Each has trade-offs to discuss.
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Speak to a breast cancer specialist
Call the helpline or leave your details, and someone will help you arrange a consultation at the CION centre nearest you. One helpline serves every CION centre.
Call 1800 202 8726
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Sources
- American Cancer Society — Breast reconstruction using your own tissue
- Macmillan Cancer Support — Breast reconstruction using your own tissue
- Cancer Research UK — Breast reconstruction
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.