Abstract
A 76-year-old man had an abnormal shadow on chest radiograph. Chest CT and MRI showed a mass of 6 cm in diameter, with calcifications and areas of fat attenuation within it. An axial view showed a well-defined mass between the mediastinum and right lung with an extrapleural sign. A mediastinal teratoma was suspected. Thoracotomy revealed a protruded mass lesion from the right lower lobe. Right lower lobectomy was performed. On histological analysis, a pulmonary hamartoma was diagnosed.
