Pneumothorax is a condition in which lung(s) collapse when an air-pocket develops between the two layers of pleura. The pressure within the lungs is usually greater than the pressure in the pleural space. Accumulation of air/gas within the pleural space can cause the pressure in the surrounding pleural space to exceed the air-pressure within the lungs.
When the pressure in the pleural space exceeds the pressure within the lungs, it can cause the lungs to partially or completely collapse. More.
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