WE WISH to present the case histories of 3 patients with mediastinal tumors on whom we have operated during the past six months and to point out some of the diagnostic and therapeutic problems encountered. It has been our teaching practice to identify these tumors at least in part by their position as determined by roentgenograms of the chest in the arbitrarily drawn divisions of the mediastinum. Thus we can generally state that the most commonly encountered tumor of the posterior mediastinum is the neurofibroma. Particularly is this true if we consider any circumscribed, rounded, solid mass discovered either in the course of a routine examination of the chest or in the investigation of more definite intrathoracic symptoms. That one should be prepared to find and deal with other tumors which in all their clinical features resemble neurofibromas is exemplified in our first case.
—Mrs. Mollie C., a