Hemangiomas are frequently observed in various tissues and locations in the body. However, a review of the literature revealed but 1 case in which the tumor was located in the mediastinum.1 This was a malignant hemangioendothelioma occurring in a man. The tumor was removed but the patient died two months after the operation. A postmortem examination revealed some of the primary growth as well as secondary metastases to the lungs. A monograph on tumors of the mediastinum by Heuer and Andrus2 as well as textbooks on thoracic surgery have not mentioned hemangiomas in this location. The following case is reported because of the unusual site and size of the tumor and because of the interesting postoperative course. CASE REPORT History. —R. B., a white man 34 years of age entered the Frank Billings Medical Clinic because of an unusual opacity in the left pulmonary field found on routine roentgen