History: 55 year old male with history of hypertension and diabetes presents with shortness of breath.
This is the typical appearance of paraseptal emphysema, which is caused by destruction of alveolar ducts and alveoli in the periphery of the secondary pulmonary lobules. When these lucencies become larger than 10 mm, they are classified as bullae. Having bullae put you at risk for a spontaneous pneumothorax, and particularly pneumothorax when flying.
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