A 53 year old male was admitted to the Okayama University Medical School Hospital in June 1975 with a history of chronic cough and sputum. The patient had previously undergone treatment for pulmonary tuberculosis for 18 months at another hospital. Roentgenologic examination showed a lobulated mass and fibrotic density in the left upper lung field. Left upper lobectomy was performed. The histopathologic diagnosis was pulmonary bronchogenic cyst with pulmonary tuberculosis in the same segment. In this report, the roentgenological findings and differential diagnosis of pulmonary bronchogenic cyst are described.