figure 6-13 Principal vascular rings which may compress trachea. A, Mayo type IA: double aortic arch, dominant right arch. B, Mayo type IIIB1: right aortic arch, left ligamentum arteriosum, retroesophageal left subclavian artery. C, Type IIIA: right aortic arch, left ligamentum arteriosum, mirror image left brachiocephalic artery. Ligamentum may connect to the brachiocephalic artery or to the upper descending aorta. Adapted from Stewart JR et al.33 A = aorta; E= esophagus; LA = ligamentum arteriosum; PA = pulmonary artery; RCC, LCC = right, left common carotid arteries; RS, LS = right, left subclavian arteries; V = vagus nerve.
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