Breast Fibroadenoma

A fibroadenoma is a painless, unilateral, benign (non-cancerous) breast tumor that is a solid, not fluid-filled, lump. It occurs most commonly in women between 14 and 35 but can be found at any age. Fibroadenomas shrink after menopause and, therefore, are less common in post-menopausal women. Fibroadenomas are often referred to as a 'breast mouse' due to their high mobility. Fibroadenomas are a marble-like mass comprising both epithelial and stromal tissues located under the skin of the breast. These firm, rubbery masses with regular borders are often variable in size.