Vascular ring 2010-04-29T10:18:47Z Vascular ring of aorta SNOMEDCT_US:110409004 SNOMEDCT_US:66403007 A developmental defect of the aortic arch system in which the trachea and esophagus are completely encircled by connected segments of the aortic arch and its branches. This occurs if the normal process of regression and persistence of the bilateral embryonic aortic arches fails. UMLS:C0221214 HP:0010775 Fyler:2760 Abnormal branching pattern of the aortic arch