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A 74-year-old man who had undergone transcatheter arterial embolization for hepatitis C virus-related hepatocellular carcinoma (Couinaud's segment III/IV) in April 2003 and percutaneous ethanol injection for recurrence at the same site in February 2006 was found to have dilation of the intrahepatic bile duct by computed tomography in October 2008. Contrast-enhanced computed tomography and magnetic resonance cholangiopancreatography showed a thrombosis occupying the left hepatic duct to the lateral branches with peripheral bile duct dilation. Serum concentration of alpha-fetoprotein was elevated. We performed a left hepatectomy under a preoperative diagnosis of hepatocellular carcinoma with bile duct invasion. The cut surface of the resected specimen showed a tumor thrombosis occupying the region between the left hepatic duct and lateral branches, but no tumor in the liver parenchyma. Histologic examination showed that the thrombosis in the intrahepatic bile duct was hepatocellular carcinoma. Since part of the hepatocellular carcinoma in the region treated with percutaneous ethanol injection was adjacent to the tumor thrombosis in the intrahepatic bile duct in diagnostic imaging, we diagnosed implantation into the intrahepatic bile duct due to percutaneous ethanol injection. The postoperative course was uneventful and the patient is doing well without recurrence 8 months after the operation.

Tumor Implantation into the Intrahepatic Bile Duct after Percutaneous Ethanol Injection Therapy for Hepatocellular Carcinoma