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In page Congenital diaphragmatic hernia:

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This condition can often be diagnosed before birth and fetal intervention can sometimes help, depending on the severity of the condition.[1] Infants born with diaphragmatic hernia experience respiratory failure due to both pulmonary hypertension and pulmonary hypoplasia. The first condition is a restriction of blood flow through the lungs thought to be caused by defects in the lung. Pulmonary hypoplasia or decreased lung volume is directly related to the abdominal organs presence in the chest cavity which causes the lungs to be severely undersized, especially on the side of the hernia.[citation needed]