title: Massive occult retroperitoneal hemorrhage during hip surgery.
mesh_terms: D000368:Aged; D001158:Arteries / Q000293:injuries; D002081:Buttocks / Q000098:blood supply*; D006470:Hemorrhage / Q000209:etiology*; D006621:Hip Joint / Q000601:surgery*; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D012187:Retroperitoneal Space