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Figure 3 The snare–coil–Berenstein unit is adjusted so that only the proximal coil tip is in the main pulmonary artery and the rest is in the descending aorta. The entire coil is then delivered out of the Berenstein into the descending aorta, and the coil loops reform within the aortic ampulla and descending aorta. The tracheal air column (between white arrows) is critical for proper coil delivery.
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