blunt duct adenosis

blunt duct ad·e·no·sis

adenosis of the breast in which the ducts are enlarged but not increased in number.

blunt duct adenosis (breast)

An older term still in common use for a columnar cell lesion (the increasingly preferred term), a histologic finding characterised by the presence of columnar epithelial cells lining the terminal ductulo-lobular unit which, if accompanied by atypia, is termed flat epithelial atypia.
Clinical findings
BDA (CCL) is often multifocal, occurs in women age 35–50, associated with microcalcifications and thus identified by mammography.