invasive ductal breast carcinoma pleomorphic breast carcinoma MONDO:0006050 EFO:1000047 anaplastic breast carcinoma NCIT:C5161 MEDGEN:307976 UMLS:C1514169 A rare, aggressive, high grade invasive ductal carcinoma, not otherwise specified. It is characterized by the presence of pleomorphic and bizarre malignant cells that constitute more than 50 percent of the malignant cellular infiltrate.