title: Flank pain in early renal failure.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D007674:Kidney Diseases / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012185:Retroperitoneal Fibrosis / Q000150:complications / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D014517:Ureteral Obstruction / Q000209:etiology