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Fig. 3A —Modified Glenn shunt. Sketch of bidirectional Glenn shunt. Diagram depicts postoperative anatomy of bidirectional Glenn shunt (gray) in which superior vena cava (SVC) is disconnected from right atrium and anastomosed to undivided right pulmonary artery, providing flow for both lung fields. As with classic Glenn shunt, bidirectional cavopulmonary shunt is less likely to engender pulmonary vascular obstructive disease than systemic artery–to–pulmonary artery shunts and involves only minimal distortion of pulmonary artery architecture.