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TAPVR (a) Type I TAPVR. Chest radiograph obtained in a neonate (b the same as a with a superimposed drawing) reveals the classic snowman sign, sometimes referred to as a figure-of-eight sign.

TAPVR (b) Chest radiograph obtained in a neonate (b the same as a with a superimposed drawing) reveals the classic snowman sign, sometimes referred to as a figure-of-eight sign.

I drew similar (but not as good) diagrams of cats and frogs when I took Comparative Anatomy. Rachel remembers. :D

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TOF (a) Chest radiograph obtained in a neonate (b the same as a with a superimposed drawing) reveals the classic snowman sign, sometimes referred to as a figure-of-eight sign.

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

TGA (b)- Same image as (a) with a superimposed drawing shows the characteristic cardiomediastinal silhouette: the egg-on-a-string sign.