We present the case of a 1-day-old newborn, with prenatal diagnosis of Trisomy 18 and complex congenital heart disease. Echocardiography at birth showed double outlet right ventricle with non-committed interventricular communication in the setting of mitral atresia, hypoplastic left ventricle, and patent aortic root with bicuspid aortic valve and type A interrupted aortic arch. Adding anomalies were the typical congenital polyvalvular disease, Chiari network, and left intra-atrial shelf dividing morphologically left atrium. This is a rare combination of cardiac anatomical malformations in Trisomy 18.
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