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Figure 4 Complete circumferential and transmural lesion at the veno-atrial junction of the left superior pulmonary vein (LSPV). Same ablated pulmonary vein as seen in Figure 2. (A) Fluoroscopic image of the inflated balloon engaged at the LSPV orifice (arrows). (B) Photograph of the left atrium open showing a well-demarcated lesion at the veno-atrial junction that extended to a wide area outside the LSPV ostium. (C) (Masson trichrome stain; 2.5x; bar = 1 mm), photomicrograph of a transverse section at the veno-atrial junction; a circumferential and transmural lesion is shown. LIPV = left inferior pulmonary vein; LMPV = middle branch of the left superior pulmonary vein; other abbreviations as in Figure 1.
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