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Fig. 4. —46-year-old man who presented with painful swelling of left leg. He had suffered from lower back pain for several days. Patient had episode of deep vein thrombosis in his right leg 17 years earlier. Sonogram showed ileofemoral thrombosis, tiny right kidney, slightly enlarged liver, and absence of portal vein. Axial contrast-enhanced CT scan obtained at level of porta hepatis shows portal vein to be absent and shows multiple small veins representing cavernous transformation of portal vein (arrow). Intrahepatic segment of inferior vena cava is small, and dilated azygos and hemiazygos veins (arrowheads) are shown on both sides of aorta in retrocrural space.

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