atypical ductal breast hyperplasia
(ay-TIH-pih-kul DUK-tul brest HY-per-PLAY-zhuh)
A benign (not cancer) condition in which there are more cells than normal in the lining of breast ducts and the cells look abnormal under a microscope. Having atypical ductal breast hyperplasia increases the risk of breast cancer. Also called ADH and atypical ductal hyperplasia.