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Fig. 1B. —75-year-old man with percutaneous radiofrequency ablation of recurrent hepatocellular carcinoma. He had undergone hepaticojejunostomy due to biliary stricture after left hepatectomy for hepatocellular carcinoma. Oblique sonogram obtained 3 days after radiofrequency ablation shows massive hyperechogenicity (arrows) representing air in ablation zone. Patient presented to emergency department with high fever (40°C) and abdominal pain.