Double aortic arch

(A) Double aortic arch, viewed from anterior. The right arch is usually the larger of the 2 arches. A ligamentum arteriosum connects the left arch to the pulmonary artery.

(B) A computer-reconstructed image of a magnetic resonance angiogram viewed from postero-superior. The star is in the center of the vascular ring, where the trachea and esophagus are encircled (not shown in this projection).