Unexplained retroperitoneal air.
D000230:Adenocarcinoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D000368:Aged; D012809:Colon, Sigmoid / Q000473:pathology; D004239:Diverticulitis, Colonic / Q000175:diagnosis*; D006801:Humans; D008297:Male; D011859:Radiography; D012187:Retroperitoneal Space; D012421:Rupture; D012811:Sigmoid Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology