Pneumatocele :
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Pneumatoceles are thin-walled, air-containing cysts of the lungs.
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They are classically associated with S. aureus, but may occur with a variety of organisms.
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Pneumatoceles frequently occur in association with empyema.
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In most cases, pneumatoceles involute spontaneously, and long-term lung function is normal.
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However, on occasion, pneumatoceles result in pneumothorax.
