Medical Oncologist
Reconstruction
Fat grafting to improve reconstruction results
Fat grafting takes fat by liposuction from your tummy, thighs or flanks and injects it into the reconstructed breast to smooth contours, fill dents and soften implant edges. It is a refining procedure rather than a reconstruction in itself, and not all the transferred fat survives.
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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The short answer
What is fat grafting, and what does it fix?
Fat is taken by liposuction from your tummy, thighs or flanks, processed, and injected into the reconstructed breast to smooth contours, fill dents and soften the edges of an implant. It is a refining procedure rather than a reconstruction in itself.
What it is genuinely good at
Filling a hollow above an implant, softening a visible implant edge, adding a little volume, and improving the quality of skin that has been irradiated. It makes a reasonable reconstruction look considerably more natural.
What it cannot do
It cannot build a breast from nothing. Volumes that can be transferred at one sitting are modest, so it is used to refine an existing reconstruction rather than to replace an implant or a flap.
The part people are not told
Not all the fat survives. A meaningful proportion is reabsorbed over the first months, which is why more than one session is usual and why surgeons deliberately overfill. Expect to be told the final result after several months, not several weeks.
Ask how many sessions your surgeon expects, and whether each is charged separately.The procedure
What happens on the day
Marking the donor site
Done standing, usually tummy, thighs or flanks. Where the fat comes from matters less than there being enough of it, so your surgeon picks a practical area.
Liposuction
Fat is drawn out through small incisions. This is the part that leaves the donor area bruised and sore, often more uncomfortable afterwards than the breast itself.
Processing
The fat is cleaned and separated from fluid and blood so that what is injected is as pure as possible, which improves how much of it survives.
Injecting in fine layers
Small amounts placed through multiple passes rather than one large deposit. Spreading it out is what allows a blood supply to reach the transferred fat.
Recovery
Usually a day case or one night. Bruising and soreness at the donor site for a couple of weeks, and a compression garment there for several weeks.
What to know
The things that shape the result
Mostly about how much fat survives and how many sessions that implies.
Expect more than one session
Because a proportion of the fat is reabsorbed, two or three sittings spaced months apart is common. Plan for that rather than being disappointed after the first.
You need enough spare fat
Very slim women may not have a usable donor site, and weight loss afterwards reduces the transferred fat just as it reduces fat anywhere else on your body.
Significant weight change alters the result.It helps irradiated skin
One of its more useful effects. Grafted fat appears to improve the quality and softness of skin damaged by radiotherapy, which matters where an implant sits underneath.
It can produce firm lumps
Fat that does not survive can form areas of fat necrosis, which feel like hard lumps. Harmless, but indistinguishable from a recurrence by touch, so each needs checking.
Ask beforehand
- How many sessions do you expect
- Where will the fat be taken from
- How will lumps afterwards be assessed
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Words you will hear
The vocabulary, in plain language
- Lipofilling, or lipomodelling
- Other names for fat grafting. All describe the same procedure.
- Donor site
- Where the fat is taken from, usually tummy, thighs or flanks. It has its own bruising and recovery.
- Graft take
- The proportion of transferred fat that survives. Never all of it, which is why repeat sessions are usual.
- Resorption
- The body reabsorbing fat that did not establish a blood supply. Happens mostly in the first few months.
- Fat necrosis
- Fat that has died and formed a firm lump. Harmless, but it needs checking because it feels like a recurrence.
- Oil cyst
- A fluid-filled area that can follow fat necrosis. Usually recognised confidently on ultrasound.
Being straight with you
Safety, lumps and follow-up
Fat grafting is not considered to raise the risk of breast cancer returning, and it is widely used after reconstruction. The practical complication is lumps, and the confusion they cause.
Every new lump still gets checked
Fat necrosis after grafting feels exactly like a recurrence to the hand. Radiologists expect to see it and can usually recognise it on ultrasound, but that means a scan rather than reassurance over the phone. Expect to be sent for imaging.
Tell any new doctor you have had it
Particularly if you move hospital. A firm lump in a reconstructed breast reads very differently to someone who knows fat grafting was done and to someone who does not.
The donor site is the sorer part
Most women are surprised that the liposuction area hurts more than the breast. Bruising is extensive and a compression garment is worn for weeks. Plan the recovery around that rather than around the chest.
Keep your own note of what was done
Record the date, the donor site and roughly how much was transferred, and keep it with your surgery notes. Years later, when a firm area is found and a new doctor asks what operations you have had, that single line saves a great deal of investigation.
Results take months to judge
Volume drops as unsurvived fat is reabsorbed, so the breast looks fuller immediately afterwards than it will end up. Do not assess the outcome before three or four months.
Commonly believed
What women are told about fat transfer
A whole breast can be built from fat alone.
Volumes transferable at one sitting are modest and much of it is reabsorbed. Fat grafting refines an existing reconstruction rather than replacing an implant or a flap. Anyone promising a whole breast this way is overselling it.
Injecting fat could feed a cancer.
It is not considered to raise the risk of the cancer returning and is widely used in breast reconstruction. If this worries you, ask your surgeon directly rather than declining a procedure that would have improved the result.
Once it is done, it is permanent.
Fat that survives behaves like the rest of your body fat, so it grows and shrinks with your weight. Significant weight loss after grafting reduces the result, which is worth knowing before planning either.
A lump afterwards means it went wrong.
Fat necrosis is a recognised and harmless outcome of grafting, not a failure. It does need checking, because it feels the same as a recurrence. Expect a scan rather than reassurance over the telephone.
Questions we are asked
Common questions about fat grafting
How many sessions will I need?
Commonly two or three, spaced several months apart, because a proportion of each graft is reabsorbed. Your surgeon can estimate from what needs correcting. Ask whether each session is charged separately, since that affects the total considerably.
Which part hurts more, the breast or the donor site?
Almost always the donor site. Liposuction leaves extensive bruising and soreness for a couple of weeks, with a compression garment worn for longer. The breast itself is usually comfortable, particularly where the skin is numb.
Will it interfere with future scans?
Radiologists expect to see changes after fat grafting and can usually recognise them. Tell any imaging department that you have had it, especially if you move hospital, because it changes how a firm area is interpreted.
Can it be used after a lumpectomy?
Yes, to fill a dent left by breast-conserving surgery or radiotherapy. It is one of the more satisfying uses, because a small hollow is exactly the problem fat grafting corrects well.
What if I am very slim?
You may not have a usable donor site, and your surgeon will say so after examining you. Where fat is limited, more sessions with smaller volumes is sometimes possible, but there is a practical floor.
How long before I see the final result?
Three to four months, once the unsurvived fat has been reabsorbed. It looks fuller immediately afterwards than it will end up, which is deliberate. Judging it at two weeks tells you nothing useful.
Is it covered by insurance?
Sometimes as part of reconstruction and sometimes classified as cosmetic, particularly for later refining sessions. Get written confirmation before booking, and ask specifically about second and third sessions.
Can it help radiotherapy damage?
It appears to improve the softness and quality of irradiated skin, which is one of its more valuable effects where an implant sits underneath firm tissue. Ask your reconstructive surgeon whether it would help in your case.
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Sources
- Cancer Research UK — Breast reconstruction techniques
- National Cancer Institute — Breast reconstruction after mastectomy
- Breast Cancer Now — Lipofilling after breast surgery
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