Figure 9d. (a) Lateral esophagram shows unusually prominent posterior indentation (arrow), from an anomalous right subclavian artery arising from a diverticulum, in the esophagus of an infant who had feeding problems. The airway is normal. (b) Original image of the Kommerell diverticulum, with an anomalous right subclavian artery arising from the diverticulum off the left aortic arch (posterior view). (Reprinted, with permission, from reference 17.) (c, d) T1-weighted MR images (750/30) obtained in the patient in a. (c) Coronal image shows a normal trachea. (d) More posterior coronal image shows a diverticulum (arrow) arising from the right side of the left descending aorta. The diverticulum gave rise to an anomalous right subclavian artery.