label: Anal Extramucosal (Perianal) Adenocarcinoma
label_lc: anal extramucosal (perianal) adenocarcinoma
description: "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."