Congenital bronchopulmonary malformations
are uncommon diseases. Most of the abnormalities
are classified as cystic lung lesions. The pathology
of disease begins during embryonic development.
Normally, the lower respiratory system will generate
from the laryngotracheal diverticulum within four
weeks of gestation(21) and development of the lung
buds at GA five weeks. Over the next 24 weeks, all
17 branches will develop. During this period of
development, many factors lead to the abnormal
developments. It is hypothesized that the major causes
of airway obstruction(21) are cystic changes arising in
the lung parenchyma.