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a Gross section of ablation zone which resulted in pneumothorax. b Histologic section (H&E stain) corresponding to gross lung section at the site of pleural rupture. Apex of the lobe has a clear space (∼0.5 cm) that subtends a focally extensive area of thin and frayed pleura with fibrin and embedded degenerate leukocytes adhered to the surface (open arrow). Tear in the pleura (closed arrow). Parietal pleura separated from pulmonary parenchyma by clear space (arrow heads).
