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Fig. 8B —43-year-old man with subacute Budd-Chiari syndrome. Venovenous collaterals are anomalous curvilinear vessels that usually drain to inferior vena cava, although sometimes inferior vena cava does not show evidence of connections with other vessels. Color Doppler sonogram in intercostal plane shows multiple anomalous, curvilinear veins (arrows) draining to inferior vena cava (arrowheads).