Malignant fibrous histiocytoma of the mediastinum.

A case of malignant fibrous histiocytoma in the right postero-superior mediastinum in a 43-year-old male patient is presented. He was operated on and a part of the tumor including the infiltrated second segment of the lung was resected. At reoperation, the great vessels were found infiltrated by the tumor and radical exstirpation could not be carried out. The patient died 4 months after discovery of his disease due to further growth of the tumor. This case is the fifth malignant fibrous histiocytoma of the mediastinum described in the world literature.