BS14 UPDATE ON IN SITU PROLIFERATIONS OF THE BREAST

This is a pathologist’s view of in situ proliferations of the breast, particularly those other than DCIS. The increasing evidence for Lobular Carcinoma In Situ (LCIS) as a non-obligate precursor, at least in some instances, and the emerging entity of pleomorphic LCIS will be discussed. Columnar cell proliferations including Flat Epithelial Atypia will also be presented with particular emphasis on clinical significance and currently recommended management strategies. A short discussion of other "indeterminate" in situ proliferations will also be included.