Reports of simultaneous pneumonectomy and esophagectomy for synchronous lung and esophageal carcinoma are extremely rare. We report on a 64-year-old male patient with lung adenocarcinoma who was originally scheduled to undergo a left pneumonectomy. During the operation, an esophageal squamous cell carcinoma was discovered in the mid-thoracic esophagus. Thus, a simultaneous left pneumonectomy and esophagectomy was performed, and part of the pericardium was sutured to the tunica adventitia of the descending aorta using a "net-making" method for prevention postoperative dilatation of the stomach.