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Y-shaped Bifurcated Graft to Pulmonary Arteries After Arterial Switch Operation. Pulmonary artery stenosis is a frequent complication after arterial switch operation. This case study presented a complex pulmonary artery stenosis initially treated with bilateral pulmonary artery stenting. The patient was found to have aortic valve endocarditis and recurrent pulmonary artery stenosis. The aortic valve was replaced and the pulmonary valve was repaired, followed by interposition of a Y-shaped graft from the sinotubular junction to both pulmonary arteries. The patient had an uneventful recovery and was discharged home asymptomatic after endocarditis antibacterial treatment.