obsolete_breast ductal adenocarcinoma true EFO:0006318 http://purl.obolibrary.org/obo/MONDO_0005590 NCIT:C4017 3.88.0 duct carcinoma MESH:D018270 ductal breast carcinoma Replaced by Mondo term MONDO_0005590, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0005590 ductal carcinoma DOID:3007 ductal breast adenocarcinoma breast ductal carcinoma breast ductal adenocarcinoma ductal adenocarcinoma ductal carcinoma of the breast mammary duct adenocarcinoma duct adenocarcinoma ductal carcinoma of breast A breast carcinoma arising from the ducts. While ductal carcinomas can arise at other sites, this term is universally used to refer to carcinomas of the breast. Ductal carcinomas account for about two thirds of all breast cancers. Two types of ductal carcinomas have been described: ductal carcinoma in situ (DCIS) and invasive ductal carcinoma. The latter often spreads to the axillary lymph nodes and other anatomic sites. The two forms of ductal carcinoma often coexist.