Leiomyosarcoma of the inferior vena cava causing Budd-Chiari syndrome--a case report.

A forty-eight-year-old Japanese woman with leiomyosarcoma of the inferior vena cava presenting as Budd-Chiari syndrome is reported. A large tumor originating from the venous wall grew into the lumen, obstructing the hepatic vein, and extended up to the right atrium. Although this is a very rare tumor, care should be taken in order to make an early diagnosis and manage the condition effectively.