Crohn's disease of the appendix presenting as acute appendicitis.
D000208:Acute Disease; D000328:Adult; D001064:Appendicitis / Q000175:diagnosis*; D001065:Appendix; D003424:Crohn Disease / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D012002:Rectal Diseases; D012003:Rectal Fistula