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Fig. 4B. —CT scans obtained 24 hr after ablation of radiofrequency lesion (same lesion as shown in Fig. 2A,2B,2C,2D). Contrast-enhanced arterial (B) and portal venous (C) phase CT scans show variable hyperemic rim (straight arrows) surrounding hypodense, nonenhancing core (arrowheads). Note how second lesion (curved arrow), located medially, is partially imaged only.