[RI venography for retroperitoneal hematoma following anticoagulant therapy for IVC filter thrombosis].

We presented a case of massive retroperitoneal hematoma owing to anticoagulant therapy for IVC filter thrombosis. CT showed the hematoma as high density area. RI venography demonstrated the thrombosis and collateral veins, suggesting the sites of anticoagulant induced bleeding and resultant hematoma. We suppose that RI venography is useful for the follow-up study of the IVC filter inserted cases.