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Figure 3 Correlation of radiofrequency lesion size and peripheral enhancement. Shown is the lesion size assessed in the pathological specimen compared with the lesion size assessed by magnetic resonance imaging (MRI) during the Phase 1 of contrast void (A), Phase 2 of peripheral enhancement (B), and Phase 3 of "very" delayed enhancement (C). Increasing thickness of peripheral enhancement over time observed as a rim of high signal intensity surrounding a center of low signal after the injection of 0.225 mmol/kg of gadolinium (D).