[A case of venous hemangioma in the mediastinum].

A thirteen-year-old boy was admitted to our hospital for further evaluation of abnormal shadow on chest film with a low grade fever. Laboratory findings revealed within normal value except for CRP. Chest film showed a smooth round mass in right middle mediastinum. In the CT scan, it was a well-defined round mass with low density in contact with sternum. With angiography, it had no relation to the great vessels. At operation, a coagulation was on the surface of a tumor. The tumor adhered to sternum and parietal pleura firmly and to aortic arch and thymus partly. But it was removed with ease "en bloc". It was dark red in color and upper part of was cystic, and lower massive. The tumor measured 9.5 x 5.0 x 5.5 cm and weighted 320 g. Histopathological findings demonstrated venous hemangioma proved by Masson trichrome stain.