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Patient with lesion at liver dome. Contrast enhanced axial CT slice shows low attenuation lesion adjacent to a high attenuation lesion (arrow) in dome of liver (a). Rigid registration of PET/CT pre-RFA shows abnormal FDG uptake over low attenuation lesion adjacent to high attenuation lesion (b). Post-RFA CT fused with pre-RFA PET (c) verifies RFA treatment zone with margins covering the area of abnormal FDG uptake (arrow)
