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Axial T1-weighted fat-saturated MR in late arterial phase obtained (a) pretreatment: image shows nonrim arterial phase hyperenhancement (APHE) of a small HCC (arrow). b 1 month post radiofrequency ablation (RFA): image shows irregular rim enhancement and more nodular APHE at posterolateral margin (arrow). The treated observation is categorized LR-TR equivocal. c 4 months post RFA: image shows no suspicious enhancement; the treated observation is now categorized LR-TR Nonviable
