Fig. 8
From: Computed tomography in the evaluation of vascular rings and slings
Left aortic arch with an aberrant right subclavian artery. a Illustration showing the appearances of a left aortic arch (arrow) with an aberrant right subclavian (RSC) artery. The first branch from the arch is the right common carotid (RCC) artery, followed by the left common carotid (LCC) artery and then the left subclavian (LSC) artery. The right subclavian (RSC) artery has an aberrant origin as the last branch originating from the proximal descending thoracic aorta and has a retroesophageal (E) course to reach the right side. b Axial CT scan shows an aberrant right subclavian artery (arrow) originating from the proximal descending thoracic aorta and has a retroesophageal course to reach the right. Posterior indentation and compression of oesophagus are seen. c Coronal MIP image demonstrates the aberrant right subclavian artery (arrow) originating from the proximal descending aorta and reaching the right. Normal left subclavian artery (arrowhead) is also seen. d Coronal reconstructed 3D volume-rendered image shows the aberrant right subclavian artery (arrow) originating from the proximal descending thoracic aorta (*) and coursing to the right behind the oesophagus, which is compressed