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Caudal to the inferior vena cava filter, the IVC, iliac veins, common iliac veins, and visualized femoral are enlarged and do not opacify with contrast. There is subtle pericaval and perivenous stranding and haziness. There is subcutaneous edema in the thighs. There is engorgement of the epidural venous plexus on the sagittal images (particularly L5 and sacrum), indicated collateral flow.
There is also left hepatic lobe atrophy and diminutive size of the left portal vein. In this thrombogenic patient, this is suggestive of prior portal vein thrombosis.