Carcinoma associated with anal fistula.
D000230:Adenocarcinoma / Q000209:etiology*; D000368:Aged; D001005:Anus Neoplasms / Q000209:etiology*; D002908:Chronic Disease; D005401:Fissure in Ano / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged