Pathology of the lung in the fetus and neonate, with particular reference to problems of growth and maturation

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Abstract
The major forms of lung pathology in the perinatal period are reviewed with emphasis on disturbances of growth and maturation. Lung hypoplasia results from impairment in the physiological control of lung growth during the fetal period. It is more common than organogenetic defects which are discussed only briefly. Hyaline membrane disease is now seldom seen in a pure form due to improvements in perinatal care. However, its complications and sequelae such as interstitial emphysema, pneumothorax and bronchopulmonary dysplasia are encountered more frequently. In addition, a wide variety of pathological processes may localize to, or be expressed in, the lung of the newborn, notably asphyxial changes, persistent pulmonary hypertension, haemorrhage and infection.