[Bronchogenic cyst of the diaphragm: a case report]

A 30-year-old man was treated surgically for bronchogenic cyst originating from the diaphragm. An abnormal shadow was found on a routine chest roentgenogram. The tumor was located in the left vertebro-phrenic angle. CT scan showed a CT number of 34.2, which MRI examination revealed with low intensity on the T1 weighted image and high intensity on the T2 weighted image. A multilocular cystic tumor filled with viscid fluid, about 3 cm in size, was resected. This was diagnosed as a bronchogenic cyst, as microscopic examination showed bronchial epithelium, one layer of smooth muscle, bronchial glands, and cartilage. This is the 10th case of diaphragm-related bronchogenic cysts reported in Japan. Of these 10, 7 were located at the vertebro-phrenic angle.