breast intraductal proliferative lesion flat ductal epithelial atypia https://www.malacards.org/card/flat_ductal_epithelial_atypia flat ductal epithelial atypia UMLS:C1333620 flat ductal epithelial atypia of the breast flat epithelial atypia of the breast flat epithelial atypia clinging carcinoma NCIT:C36086 DIN 1A ductal intraepithelial neoplasia, grade 1A DOID:6841 A breast lesion characterized by the presence of dilated terminal ductal lobular units in which the epithelial lining has been replaced by a single layer of mildly atypical cells, or there is atypical, monotonous epithelial hyperplasia of three to five layers. This lesion relates to columnar cell change with atypia and columnar cell hyperplasia with atypia. FEA MONDO:0004008 MEDGEN:232508