Aspirin-induced bilateral renal hemorrhage after extracorporeal shock wave lithotripsy therapy: implications and conclusions.

We report a case of bilateral intrarenal, subcapsular and perirenal hematomas after extracorporeal shock wave lithotripsy. Following treatment chest pain developed necessitating monitoring in the intensive care unit and cardiac evaluation. Serial hematocrit levels during the next 2 days revealed a decrease from 48 to 23%, requiring multiple transfusions. After therapy it was recognized that the patient had taken aspirin on a daily basis within 1 week before lithotripsy. We postulate that the aspirin ingestions acted as a potential predisposing factor in the formation of the bilateral renal hematoma.