Diagnose this unusual case in gastroenterology.
D000230:Adenocarcinoma / Q000175:diagnosis*; D001706:Biopsy; D003082:Colectomy; D003093:Colitis, Ulcerative / Q000150:complications* / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000175:diagnosis*