Definition

A benign (not cancer) tumor that most often forms in the breast and is made up of fibrous (connective) tissue and glandular tissue. A fibroadenoma is usually painless. It often feels like a hard, round lump with a smooth, well-defined border that moves easily under the skin of the breast. Fibroadenomas may go away on their own or may need to be removed. They often get smaller after menopause. Fibroadenomas are the most common type of benign breast tumor. They can occur at any age but are more common in younger women. Most fibroadenomas do not increase the risk of breast cancer.