Fibroadenomas are the most common solid (non-liquid), benign breast tumor in women of all ages.  In 20% of cases, their number is more than one. The majority of solid tumors (masses) in the breast that we consider radiologically benign are fibroadenomas.

When a suspicious fibroadenoma lesion is first detected, it is followed up at six-month intervals for 2.5-3 years and it is decided by reasoning that this is definitely a benign lesion. Because even if fibroadenomas do not turn into cancer, there are cancers that mimic fibroadenomas. In such cases, in order not to take risks, when a lesion suspicious for fibroadenoma is detected, it is followed up with radiological methods at six-month intervals for 2.5-3 years. The probability of fibroadenomas turning into cancer is almost non-existent. 

Fibroadenomas can grow or shrink due to hormonal effects. After menopause, they often shrink and show calcification. They may show significant growth during pregnancy and breastfeeding.