[Idiopathic thrombocytopenic purpura (ITP) associated with renal injury: report of a case].

A 42-year-old woman with gross hematuria, left flank pain and vomit after being hit on her back admitted to our hospital. She has been under treatment for idiopathic thrombocytopenic purpura (ITP) with prednisolone for these last 14 years. Computerized tomographic (CT) scan revealed moderate laceration, subcapsular hematoma and perirenal hematoma of the left kidney. We tried treating her conservatively. The main treatment was absolute rest for two weeks, increase in the prednisolone dose and prevention from infection. On the 3rd day, the platelet count dropped to 4,000/mm3, but transfusion of platelets was not done to provide for emergency. The platelet count increased gradually and returned to normal on the 8th day. We decreased the prednisolone dose according to the platelet count. After 5 weeks, microscopic hematuria disappeared. Her clinical course was uneventful and she was discharged after 7 weeks.