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Figure 1 A descending aortogram in lateral projection demonstrates a type A patent ductus arteriosus (PDA) with a minimum diameter of 3.1 mm located just anterior to the tracheal air column (between white arrows). This air column is highlighted in Figures 1 through 6 with white arrows and serves as an important reference landmark for coil positioning. A catheter with a 10-mm marker is placed in the main pulmonary artery (MPA) for measurement references. (AoD = descending aorta.)
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