Inferior vena cava--right atrial tumor thrombus in malignant pelvic bone tumors in children.

Two patients with IVC and right atrial tumor thrombus associated with malignant bone tumors are described. Other tumors such as Wilms', renal cell CA, testicular adrenal and hepatic neoplasms have also been reported to invade the IVC. Ultrasound, CT and MRI are helpful in evaluating the presence of vascular thrombosis as well as its longitudinal extent, and intracardiac involvement.