title: 44-year-old man with rectal bleeding.
mesh_terms: D000328:Adult; D003424:Crohn Disease / Q000473:pathology*; D003937:Diagnosis, Differential; D006471:Gastrointestinal Hemorrhage / Q000473:pathology*; D006801:Humans; D007082:Ileum / Q000473:pathology; D007413:Intestinal Mucosa / Q000473:pathology; D008297:Male