Abstract
A 64-year-old male was admitted to our hospital because of an abnormal chest roentgenogram showing a solitary thin-walled cavity in the left upper lung. Chest CT showed the same finding. A thin-walled cavity in the left lung was 70 mm in diameter, and the wall was 7 mm thick. He had no cough or sputum. As laboratory data demonstrated increased CEA levels, a left upper lobectomy was performed. The tumor was resected and diagnosed as squamous cell carcinoma. Primary lung cancer with thin-walled cavity is rare. The pathogenesis of the thin -walled cavity formation in this case was considered to be caused by central necrosis and check valve mechanism.
