What the operation does
A fibroadenoma excision is a small day-case operation to remove a fibroadenoma — a smooth, solid, benign lump made of normal breast lobule tissue, most common in women under 30 but seen at any age. The lump is removed through a short incision, and the breast tissue around it is closed with absorbable sutures placed under the skin so that no stitches need to be removed afterwards.
Most fibroadenomas do not need to be removed. They are not cancer and do not turn into cancer. Excision is offered when there is a specific reason — see below — not because the diagnosis itself requires it.
For background on what a fibroadenoma is and how it is diagnosed, see the non-cancerous breast conditions page and the fibroadenoma glossary entry.
When excision is recommended
Removal is offered in any of the following situations:
- The fibroadenoma is growing on serial imaging or examination. Slow growth is common and not in itself worrying, but rapid or sustained growth changes the threshold for removal.
- The fibroadenoma is large — typically over around 3–4 cm — even if it is not actively growing. Larger lesions are harder to distinguish from a phyllodes tumour on needle biopsy alone; the whole specimen is needed to confirm the diagnosis definitively. They are also more visible cosmetically.
- The lump is causing pain or discomfort, particularly cyclical pain related to the menstrual cycle.
- The biopsy result is “fibroadenoma with atypical features” or shows a phyllodes tumour rather than a simple fibroadenoma — phyllodes lesions need surgical removal even when biopsy suggests they are benign — pre-operative biopsy cannot reliably distinguish benign, borderline or malignant grade, and even benign phyllodes can recur locally if not fully excised.
- The patient prefers the lump removed for their own reasons — for reassurance, for cosmetic concern, or because of anxiety about future change.
For smaller fibroadenomas (typically under 3–4 cm), some UK centres offer vacuum-assisted excision (VAE) under ultrasound guidance as a minimally invasive alternative to open surgery — NICE has approved this approach for benign breast lesions. Open excision remains appropriate for larger lumps, phyllodes concern, or where VAE is not available or suitable.
A fibroadenoma in a young patient (typically under 25) with classic features and a clearly benign biopsy can usually be safely left alone, with reassurance. Most patients in this group choose to do so.
How the operation works
The principle is simple: the fibroadenoma is removed through the smallest reasonable incision that allows safe access, with the scar placed where it will be least visible.
Common incision approaches:
- Peri-areolar — a curved incision along the edge of the areola, hidden in the natural change of skin colour and texture. Suitable for fibroadenomas in the central part of the breast, including those some distance from the areola where the lump can be reached through a small tunnel from the peri-areolar incision.
- Inframammary — a short incision in the natural crease under the breast, hidden by the fold. Suitable for fibroadenomas in the lower part of the breast.
- Lateral — an incision in the natural skin lines on the side of the breast. Suitable for fibroadenomas in the upper outer quadrant.
- Direct over the lump — for lesions that cannot easily be reached from a hidden incision, a small incision in a natural skin line directly over the lump may give the best result.
The choice depends on where the fibroadenoma is, how big it is, and what the patient wants for the cosmetic result. The plan is shown to you at consultation, marked on a diagram.
What about future fibroadenomas?
A fibroadenoma that has been completely removed does not “grow back” in the same place. However, new fibroadenomas can develop elsewhere in the breast — particularly in younger patients who have a tendency to form them. Seeing a single fibroadenoma is usually a one-off event; some patients do go on to develop several over time, in which case a discussion at follow-up about whether to image, monitor, or remove takes the same shape as the first time.
Removing one fibroadenoma is not a long-term solution to a “fibroadenoma-prone” breast. The pattern of new lumps is unpredictable, and removing every new one is rarely the right approach. The principle remains: investigate to confirm the benign diagnosis, and remove only when there is a specific reason.
Cosmetic outcome and what to expect
For most patients, the cosmetic result is excellent — a fine line at the chosen incision site, fading over 12 months to a thin pale scar that is barely visible.
A few specific things to know:
- Larger fibroadenomas (over 3–4 cm) leave a larger cavity and a slightly more visible contour change as the breast heals. The result is still usually good but less invisible than for a small lump.
- Multiple fibroadenomas in close proximity can usually be removed through a single shared incision, with a similar cosmetic outcome to removing one.
- Peri-areolar scars in patients with darker skin can sometimes hyperpigment (become darker than surrounding skin) for a period; this usually fades but can take 12–18 months. Silicone tape and avoiding sun exposure to the scar in the early months reduce this risk.
A small number of patients have a revision procedure for a contour issue or a thickened scar; this is uncommon for routine fibroadenoma excision and would be discussed at follow-up if relevant.