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Figure 5 Gross pathology and histology of ring versus coil lesions. (A and B) Healed radiofrequency lesions in position 1 created with the 4-mm ring electrode loop catheter. (C and D) Linear lesions created with the 12-mm coil electrode loop catheter. The 4-mm lesion is elevated and visibly defines each of the ring electrodes, whereas the 12-mm coil electrode lesions are flat. The histologic sections exemplify contiguous and transmural linear lesions. Collagen formation can be seen on both histologic panels. F = fibrous tissue; Ca = calcium deposition.
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