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Fig. 2B. —Right aortic arch with aberrant left subclavian artery causing airway obstruction in 1-year-old boy. Axial T1-weighted MR image at more inferior level than A shows compression of carina (arrows) associated with midline descending aorta (D). Degree of compression at level of midline descending aorta is more severe than that at level of Kommerell's diverticulum.