CT in the axial plane after intravenous administration of iodinated contrast. There was contrast uptake by the lesion in the portal venous phase, predominantly in the periphery of the lesion. The tumor was hypovascular in the arterial phase of contrast perfusion (not shown). Small areas of intralesional necrosis were present. The peripheral margin of the lesion was blurry (arrows). These characteristics were suspicious for a malignant biological behavior of the tumor. Dilatation of the left gonadal vein was seen (°) due to extrinsic compression.