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Figure 5 Radiofrequency ablation lesion. Masson’s trichrome stain. (A) AM = adjacent myocardium; CAN = coagulation necrosis; CBN = contraction band necrosis. (B) Blue center core with severe coagulation necrosis, necrotic cavity, and complete loss of cellular structure. (C) Light purple periphery demonstrating contraction band necrosis with erythrocytes and cell debris in vasculature. (D) Adjacent viable myocardium. Calibration bars are presented in millimeters (mm).