borderline breast disease
(BOR-der-line brest dih-ZEEZ)
A group of conditions marked by changes in breast tissue that are not cancer but may become cancer. Types of borderline breast disease include atypical ductal hyperplasia, atypical lobular hyperplasia, lobular carcinoma in situ, and complex sclerosing lesion (radial scar). Having borderline breast disease increases the risk of breast cancer. Also called BBD.