Pulmonary hyperplasia is a serious pathological event which occurs in neonatal medicine. It leads to pulmonary hypertension and acute respiratory distress syndrome. Histologically the lungs classically exhibit "synchronous" hypermaturity".Wright JR Jr, Thompson DL, McBride JA et al. Asynchronous pulmonary hyperplasia associated with tracheal atresia: pathologic and prenatal sonographic findings. Pediatr Pathol Lab Med. 1995 Jan-Feb;15(1):81-97. It is thought that this condition is a lot less rare than previously thought due to under-recognition.
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