title: Case records of the Massachusetts General Hospital. Weekly clinicopathological exercises. Case 12-1979.
mesh_terms: D000368:Aged; D003424:Crohn Disease / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D012003:Rectal Fistula / Q000473:pathology*; D012007:Rectum / Q000473:pathology*; D014456:Ulcer / Q000473:pathology