Respiratory problems and cystic adenomatoid malformation of lung.

Respiratory problems and cystic adenomatoid malformation of lungCongenital cystic disease of the lung accounts for about 25% of lung malformations, and is an uncommon but important cause of neonatal respiratory distress.Congenital cystic disease includes: (1) lobar emphysema, which tends to affect a single upper lobe, is due to the obstruction of a lobar bron- chus, and is consequent upon an abnormality in the bronchial cartilage allowing bronchial collapse and distal overinflation.(2) Bronchogenic cysts, which are unilocular and lined with ciliated respiratory epithelium, and are usually adjacent to major bronchi but do not communicate with them.They probably represent a malformation developing at the time of closure of the primitive foregut.(3) Pulmonary lymphangiectasia, which is rare, usually bilateral, and is due to congenital cystic dilatations of the pulmonary lymphatics.(4) Congenital cystic adenomatoid