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Congenital pulmonary airway malformation type 3 originates in the bronchiolar regions and may involve an entire lobe, compressing other lobes. It comprises 10% of all cases and the lesions may be solid not cystic and are less than 5mm in diameter. The prognosis is good with no malignant potential; however, there is typically an absence of pulmonary arteries within the lesion.
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