Figure 5a. Bile duct stenosis and biloma in a 67-year-old woman with hepatocellular carcinoma in segment III. (a) Follow-up CT scan, obtained 6 months after RF ablation, shows mild dilatation of the intrahepatic bile duct (arrows) in the lateral segment of the liver. (b) Follow-up CT scan, obtained 11 months after RF ablation and at approximately the same level as a, shows biloma formation (arrow) as well as exacerbation of dilatation of the bile duct (arrowheads). (c) US image shows an anechoic lesion that corresponds to the biloma (arrowhead) and dilated duct (arrow).