[A case of cystic mediastinal lymphangioma].

A 41-year-old man was admitted to our hospital because of an abnormal shadow which was pointed out on the chest x-ray film in mass screening. The operation was performed through left thoracotomy. The cyst was unilobular and 43 x 36 x 36 mm in size, located in the middle position of upper mediastinum. This localization has not been reported among 46 cases of the mediastinal lymphangiomas in Japan. Preoperative diagnosis is very difficult since roentogenographic feature is few for ruling out other mediastinal tumors. The complete resection of the cyst is recommended.