simple fibroadenoma
(SIM-pul FY-broh-a-deh-NOH-muh)
A type of benign (not cancer) tumor that usually forms in the breast and is made up of fibrous (connective) tissue and glandular tissue. When viewed under a microscope, all the cells in a simple fibroadenoma look the same and have clear, defined edges. Simple fibroadenomas are more common in younger women and do not increase the risk of breast cancer.