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Fig. 2C. —80-year-old man with 3-cm hepatocellular carcinoma (arrows, A) in liver segment V who underwent one session of radiofrequency ablation therapy. Digital subtraction image (first-frame image minus third-frame image) clearly shows residual perfusion flow signals (enhancement) (arrows) in one portion of nodule and tumor perfusion defect (arrowheads) in other portion, suggesting incomplete tumor necrosis.

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