title: Proceedings: The extent of rectal premalignant change in ulcerative colitis.
mesh_terms: D001706:Biopsy; D003082:Colectomy; D003092:Colitis; D003093:Colitis, Ulcerative / Q000473:pathology*; D003110:Colonic Neoplasms / Q000175:diagnosis / Q000473:pathology; D004724:Endoscopy; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology; D012004:Rectal Neoplasms / Q000175:diagnosis / Q000473:pathology; D012007:Rectum / Q000601:surgery