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CT appearances before and after RFA of HCC. Top row: arterial (a) and portal venous phase (b) CT images showing an HCC (black arrow) before RFA. Bottom row: CT after 6 weeks of ablation; the HCC is replaced by a zone of hypodensity that is larger than the tumor and shows no enhancement (white arrow) in both the arterial (c) and portal venous phase (d).
