<unk>  is uncommon, and has been reported to develop anywhere between the ages of 11 and 30 years old, (although the defect is developmental, it does not seem to be present from birth, implying that the lesion develops at a later age). Usually the defect is unilateral (on one side only) and most commonly occurs in men.
Stafne defect
Keyhole defect
Double aortic arch
Situs ambiguus
First arch syndrome
Pulmonary hypoplasia
Pulmonary agenesis
Pulmonary atresia