Aberrant Right Subclavian Artery Aneurysm: A Rare Cause of a Superior Mediastinal Tumor

¹ New York Heart Association
² Departments of Surgery and Radiology, New York University School of Medicine, New York City

Two cases of aneurysm formation developing in an aberrant right subclavian artery are presented. The aberrant right subclavian artery represents an incomplete vascular ring which is generally asymptomatic and is usually noted as an accidental finding at necropsy. The development of an aneurysm in the aberrant vessel lying posterior to the esophagus and trachea can produce dysphgia and dyspnea from anterior displacement and narrowing. Radiographically, the aneurysm presents as a superior mediastinal tumor. Barium esophagography, tomography, and fluoroscopy are indicated to demonstrate the vascular nature of the lesion. Thoracic aortography is necessary for diagnosis. Because of the anatomic location of the aneurysm, surgery should be entertained only if rupture appears imminent or symptoms develop.