[An anal adenocarcinoma arising from the lining of an anorectal fistulous tract. The overlying anal mucosa does not show evidence of neoplastic changes. Some cases are associated with Crohn disease. ( NCI )]
UMLS (NCI) C1332258Adenocarcinoma of the Anus within Anorectal Fistula
Anal Adenocarcinoma within Anorectal Fistula