Fig. 1

Axial slice of the CT image shows the shape and route of extension of the intravenous leiomyomatosis. a This image shows that the tumour grew into the right atrium and extended to the right ventricle; b This image shows that the tumour grew along the inferior vena cava, resulting in enlargement of the vein; c These two images show that the bilateral renal veins were not invaded; d This image shows that the leiomyoma grew into the vein through the right uterine vein and internal iliac vein