Figure 5b. Typical MR imaging appearance of an RF ablation site. The patient was an 83-year-old man with RCC who had undergone RF ablation 14 months earlier. (a) Coronal single-shot fast SE T2-weighted MR image shows the ablation zone (arrow) with low signal intensity. A peritumoral rim (arrowhead) creates a bull’s-eye appearance. (b) Axial GRE T1-weighted MR image demonstrates the ablation zone (arrow) with mild heterogeneity but predominantly high signal intensity. (c) On an axial fat-suppressed fast SE T2-weighted MR image, the low-signal-intensity ablation zone (arrow) is isointense relative to the surrounding suppressed fat.