Definition

A benign (not cancerous) condition in which scar-like fibrous tissue is found in the breast lobules (the glands that make milk). In sclerosing adenosis, the lobules are larger than normal. This may result in a breast lump that may be large enough to feel. Sclerosing adenosis may also cause pain in the breast. A biopsy may be needed to tell the difference between sclerosing adenosis and breast cancer. Sclerosing adenosis may slightly increase the risk of breast cancer.