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| pneu·mo·tho·rax [ nmə tháw ràks ] |
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presence of air in pleural cavity: the presence of air or gas in the pleural cavity surrounding the lungs, causing pain and difficulty in breathing. Pneumothorax can occur spontaneously because of accidental rupture or perforation of the pleura, and in the past it was also a deliberate medical procedure in the treatment of tuberculosis.
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