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Fig. 4A. —Tracheal narrowing in 17-year-old boy with a right arch with an aberrant left subclavian artery. Accuracies for diagnoses for all observers and image types were 100%. Axial CT image obtained at lung window shows mild compression of right tracheal wall. RA = right aortic arch, LSC = aberrant left subclavian artery, T = trachea.