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Fig. 1B —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. Coronal oblique multiplanar reconstruction (MPR) shows moderate to severe narrowing (arrow) of left pulmonary artery (LPA), and good-sized, more distal left pulmonary artery. LV = left ventricle.