<unk>  is a congenital heart defect in which one of ventricular chambers is absent or very small, or a defect in which the septum between the two ventrilces is missing. These defects are also termed hypoplastic left heart syndrome or hypoplastic right heart syndrome.
Single ventricle
Pulmonary atresia
Double outlet right ventricle
Bronchial atresia
Aortic arch anomalies
Interrupted aortic arch
Transposition of the great vessels
Lung agenesis