The ascending aorta splits into 2 "arches" which pass to the right and left of the trachea and esophagus. The two arches rejoin behind the esophagus to form the descending aorta. There are two types:
Type 1 has both arches open and functioning and this type is the most common.
Type 2 has both arches intact but one is very narrow, usually the left.
Type 1 has both arches open and functioning and this type is the most common.
Type 2 has both arches intact but one is very narrow, usually the left.