Contrast enhanced axial CT abdomen of a 80-year-old female demonstrates a large, expansile, soft-tissue density mass (asterisk) posterior to the portal vein (dashed white arrows). Review of other images show the mass to be separate from the liver but distinction between this mass and the IVC was not possible. The mass was diagnosed to be leiomyosarcoma arising from the IVC following surgery. It shall be remembered that the origin or epicentre of a mass may not be confidently determined on a single image and necessitates review of series of images in different orthogonal planes. Right and left crus of diaphragm are indicated by solid white arrows