[An anal adenocarcinoma arising from the lining of an anorectal fistulous tract or the anal glands. The overlying anal mucosa does not show evidence of neoplastic changes. It usually presents as a submucosal tumor. ( NCI )]
UMLS (NCI) C1332263Extramucosal (Perianal) Adenocarcinoma of Anus
Extramucosal (Perianal) Adenocarcinoma of the Anus