<unk>  is usually due to isolated valvular obstruction (pulmonary valve stenosis), but it may be due to subvalvular or supravalvular obstruction, such as infundibular stenosis. It may occur in association with other congenital heart defects as part of more complicated syndromes (for example, tetralogy of Fallot).
Pulmonic stenosis
Pulmonary artery sling
Dextrocardia
Pulmonary vein stenosis
Pulmonary valve stenosis
Tricuspid atresia
Aortopulmonary septal defect
Double aortic arch