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Intraoperative findings. A The left atrial appendage (LAA) was exposed in front of the hilar region (asterisk). The phrenic nerve was seen on the ventral side of the defect (arrow). B After left upper lobectomy and lymph node dissection (ND2a-1). C The pericardial defect was closed with a 0.1 mm expanded polytetrafluoroethylene GoreTex® surgical pericardial membrane
