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Figure 3 sign

The figure 3 sign is seen in aortic coarctation and is formed by prestenotic dilatation of the aortic arch and left subclavian artery, indentation at the coarctation site (also known as the "tuck"), and poststenotic dilatation of the descending aorta

On barium studies of the oesophagus in patients with aortic coarctation a corresponding contour abnormality is demontrated, referred to as the reverse figure 3 sign or E sign

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