Fibroadenomas often develop during puberty so are mostly found in young women, but they can occur in women of any age. Men can also get fibroadenomas, but this is very rare.
- A fibroadenoma is usually felt as a lump in the breast which is smooth to the touch and moves easily under the skin.
- Fibroadenomas are usually painless, but sometimes they may feel tender or even painful, particularly just before a period.
Types of Fibroadenoma
Most fibroadenomas are about 1–3cm in size and are called simple fibroadenomas. When looked at under a microscope, simple fibroadenomas will look the same all over.
Simple fibroadenomas do not increase the risk of developing breast cancer in the future.
Some fibroadenomas are called complex fibroadenomas. When these are looked at under a microscope, some of the cells have different features.
Having a complex fibroadenoma can very slightly increase the risk of developing breast cancer in the future.
Giant or juvenile fibroadenoma
Occasionally, a fibroadenoma can grow to more than 5cm and may be called a giant fibroadenoma. Those found in teenage girls may be called juvenile fibroadenomas.