Hepatocellular carcinoma treatment response: Imaging findings and criteria

Figure 1 Successful hepatocellular carcinoma radiofrequency ablation in a 69-year-old woman with hepatitis C virus-related cirrhosis. A: On computed tomography obtained 1 month after radiofrequency ablation (RFA) the treated area (arrow) is slightly hyperattenuating on unenhanced phase due to coagulative necrosis; B: On corresponding hepatic arterial phase (HAP) the treated area shows no enhancement; C: On magnetic resonance imaging (MRI) obtained 2 months after RFA the treated area is slightly hyperintense on unenhanced T1-weighted image due to coagulative necrosis; D: On corresponding HAP the treated area shows no enhancement; E: On gray-scale ultrasound image obtained immediately after MRI the treated area is heterogeneously and slightly hyperechoic (arrow); F: Corresponding contrast enhanced ultrasound image achieved 18 seconds after injection shows no a hyperenhancement (arrow).