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Fig. 4A —61-year-old woman with biliary dilatation requiring a stent 24
months after liver transplantation developed hepatic artery thrombosis;
collateral arterial flow resulted in false-negative sonography. Duplex Doppler
image at porta hepatis shows arterial flow with parvus-tardus pattern (delayed
systolic upstroke and low normal resistive index of 0.55).
