title: Hemorrhagic tension cyst of the kidney.
abstract: A case of a benign renal cyst, which was filled with blood under pressure and causing acute flank pain, is presented. The pain was relieved after cyst puncture and aspiration. Although benign hemorrhagic renal cysts are well recognized, this is the first report of a benign renal cyst filled with blood under pressure.
mesh_terms: D000328:Adult; D006417:Hematuria / Q000209:etiology; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000175:diagnosis* / Q000601:surgery; D008297:Male; D010146:Pain / Q000209:etiology