<unk>  is extremely rare, progressive and usually fatal, if left untreated.
Isolated stenosis of<unk> <unk> s, as they enter into the left atrium, is a rare congenital cardiac abnormality that has significant impact on clinical outcome.
Diagnosis is difficult to suspect, especially in the absence of other cardiac abnormalities.
Symptoms and clinical signs of<unk>  are very similar to those of chronic lung disease and are very difficult to differentiate.
Pulmonary vein stenosis
Pulmonary valve stenosis
Tricuspid stenosis
Aortic arch anomalies
Pulmonic regurgitation
Overriding aorta
Bicuspid aortic stenosis
Tricuspid prolapse