Contro , Miller , White , and Potts

DURING the past decade vascular malformations of the superior mediastinum have been the object of intense clinical interest. However, the occurrence of anomalies of the pulmonary artery as a cause of tracheobronchial obstruction has gone almost unrecognized. We previously reported 3 cases in which significant respiratory obstruction was produced by a left pulmonary artery coursing anomalously above the right bronchus and behind the trachea, thus producing a "vascular sling.'"' The present report is concerned with the description of 2 patients in whom disabling respiratory difficulties resulted from pressure on the left bronchus by a large pulmonary artery aneurysm, a hitherto undescribed condition.