title: Malignant change in fistula-in-ano.
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000150:complications* / Q000473:pathology; D001706:Biopsy; D006801:Humans; D007414:Intestinal Neoplasms / Q000150:complications* / Q000473:pathology; D007420:Intestine, Large / Q000473:pathology; D008297:Male; D008875:Middle Aged; D012003:Rectal Fistula / Q000150:complications* / Q000473:pathology