Figure 10a. Injury to the gallbladder and colon in a 70-year-old man with a history of anterior segmentectomy and percutaneous microwave coagulation therapy for hepatocellular carcinoma in segment VI 2 years earlier. (a) CT scan, obtained 2 days after RF ablation of hepatocellular carcinoma in segment IV, shows gas in the biliary tract (arrowheads) and fat stranding that surrounds a fistula (arrow) between the colon and the ablated area. (b) Cholangiogram obtained with contrast material injection via the drainage tube helps to confirm injury of the gallbladder (arrow) and colon (arrowhead).