A 72-year-old woman was admitted to this institution because of hepatocellular carcinoma (HCC) and hepatitis C virus antibody positive liver cirrhosis. Abdominal ultrasonography and CT revealed an HCC measuring 5 cm in diameter in segment 7. Angiography disclosed a hypervascular tumor tumor with an arterio-portal shunt (A-P shunt) that extended to the portal trunk. The A-P shunt disappeared and ascites diminished after transcatheter arterial embolization (TAE) using a steel coil. Color Doppler ultrasonography was useful in monitoring sequential changes in direction of portal blood flow before and after TAE.