Diagram: Right Aortic Arch with Aberrant Origin of Left Subclavian Artery
Drawing of a right aortic arch with an aberrant origin of the left subclavian artery. The aortic arch crosses over the right bronchus, the definition of a right aortic arch. The order of origin of the brachiocephalic arteries arising from the aorta is right subclavian artery (RSCA), right carotid artery (RCA), left carotid artery (LCA), and left subclavian artery. The posterior esophagus and anterior trachea are encircled by a vascular ring that is completed by the ligamentum arteriosum. In this figure there is an outpouching at the base of the left subclavian artery that is termed a diverticulum of Kommerell. Other abbreviations: Asc Ao ascending aorta; LPA left pulmonary artery; MPA main pulmonary artery.