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Fig. 1A —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. Axial volume rendering with clip plane editing from IV contrast-enhanced CT shows central shunt (arrow) arising from anterior aorta to supply mildly hypoplastic right pulmonary artery (RPA). Origin of left pulmonary artery is not well seen.