Iliocaval obstruction by tumor on computed tomography

The cross-sectional CT angiogram (A) shows a right-sided psoas mass (thick arrow) compressing the IVC at the confluence of the common iliac veins with a greater degree of compression on the right common iliac vein (arrow) compared with the left iliac vein. The sagittal view (B) shows the compression on both common iliac veins by the tumor (thick arrow); note the post-stenotic dilation of the IVC (arrow).