[Bronchogenic cyst with a high computed tomography number].

A 55-year-old man was diagnosed as having colon cancer. During the preoperative survey for metastasis, chest computed tomography (CT) revealed a well-defined tumor (33 mm) with a high CT value in the left hilum. We performed thoracoscopic resection for diagnosis and treatment. The contents of the lesion were yellowish, viscid, and creamy. Pathological examination revealed that the tumor was a bronchogenic cyst. This case is reported with a review of the literature.