During the third week of gestation, the aorta develops along with the endocardial tube. The very early aorta has dorsal and ventral segments that are associated with the first aortic arch. This arch later regresses. The ventral segments form the aortic sac, while the dorsal segments form the descending aorta. Six paired aortic arches form during embryogenesis. The right dorsal aortic root subsequently regresses, which leads to the formation of the physiologically normal left-sided aorta (Murillo et al. 2012).