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TOF (b) Chest radiograph obtained in an infant with a right-sided aortic arch (b the same as a with a superimposed drawing) shows the characteristic boot-shaped sign produced by upturning of the cardiac apex because of right ventricular hypertrophy and by the concavity of the main pulmonary artery.
The spinnaker sign (also known as the angel wing sign) is a sign of pneumomediastinum seen on neonatal chest radiographs. It refers to the thymus being outlined by air with each lobe displaced laterally and appearing like spinnaker sails. This is distinct from the sail sign appearance of the normal thymus. http://radiopaedia.org/articles/spinnaker-sign