Medical Definition of pneumothorax
plural pneu·mo·tho·rax·es or pneu·mo·tho·ra·ces \-ˈthōr-ə-ˌsēz\play
: a condition in which air or other gas is present in the pleural cavity and which occurs spontaneously as a result of disease or injury of lung tissue, rupture of air-filled pulmonary cysts, or puncture of the chest wall or is induced as a therapeutic measure to collapse the lung—see tension pneumothorax; compare oleothorax
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