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Fig. 1C —15-month-old male infant who had previously undergone modified left Blalock-Taussig shunt and placement of central shunt. Left pulmonary artery could not be seen on echocardiography after central shunt was placed. AO = aorta. Oblique color-coded volume rendering from left superior perspective shows length of left pulmonary artery (LPA) stenosis ( 8 mm). Distance is particularly important to know in determining whether stenosis can be reached from midsternotomy, or if left thoracotomy is required.