Initial abdominal computed tomography (CT) of diffuse hepatic hemangiomatosis and coexistent giant cavernous hemangioma in a 78-year-old man.Axial contrast-enhanced CT image during the arterial phase shows heterogeneous nodular enhancement in both hemilivers and a contour-bulging mass with a central markedly low density area involving the caudate lobe. The expansile mass (arrowheads) protruded anteriorly, and the horizontal portion of the left portal vein was invisible, suggesting left portal vein occlusion by the mass effect of the caudate lobe lesion. The umbilical portion of the left portal vein was also invisible along the fissure for ligamentum teres (white arrow). Ascites in the right subphrenic space and dilated hepatic artery (long arrows) measuring 10-mm can be noted. There was no portomesenteric vein thrombosis (not shown).