LAUSR

A 1-year-old boy underwent computed tomographic angiography to evaluate suspected aortic arch anomalies, in view of inspiratory stridor. It showed a circumflex retroesophageal right aortic arch with the ascending aorta coursing to the right of the trachea, continuing behind the esophagus and trachea, and crossing to the left side to descend to the left of the spine (Figure 1). Figure 1. (A, B) Volume-rendered computed tomographic angiography images revealing the following branching sequence: left common carotid artery (LCCA), right common carotid artery (RCCA), right vertebral artery (RVA), right subclavian artery (RSCA), and aberrant left aberrant subclavian artery (LSCA). The left vertebral artery (LVA) was seen branching from the LCCA. (C) An axial maximum intensity projection image at the level of the aortic arch showed a circumflex retroesophageal right aortic arch coursing to the right of the trachea, continuing as a retroesophageal segment behind the trachea and esophagus, and crossing to the left of the spine. (D) An axial maximum intensity projection image at a higher level showed the relationship of the arch vessels to each other and to the trachea (T).