Squamous carcinoma arising in an anal fistula.
D002277:Carcinoma; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D005401:Fissure in Ano / Q000473:pathology*; D006801:Humans; D012003:Rectal Fistula
CARCINOMA, EPIDERMOID/pathology; FISSURE IN ANO/pathology