Alveolar capillary dysplasia (ACD) is a lethal pulmonary disorder found in newborns that is characterized by severe pulmonary hypertension and hypoxemia. We report on the clinical behavior of this disorder in a series of patients and its association with congenital heart disease, especially left heart obstructive disease; we also report a prospective diagnosis of ACD by lung biopsy in a newborn with congenital heart disease, which prevented futile and prolonged medical intervention.

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