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tension pneumothorax

ten·sion pneu·mo·tho·rax

/ˈtenSHən ˌn(y)o͞omōˈTHôˌraks/

Noun

A pneumothorax where a large amount of air becomes trapped inside the chest cavity. Positive pressure is created, much a like balloon as it fills with air. This occurs when air drawn into the space from an open wound or damaged lung cannot escape. As the pocket of air grows, pressure rises inside the cavity.