Pneumothorax - Definition

Pneumothorax (pronounced noo-moh-thor-ax) is a condition in which air or some other gas collects in the chest or the pleural space. The pleural space is the space that surrounds the lungs. When a gas collects in the pleural space, it can cause part or all of a lung to collapse. For that reason, pneumothorax is also called collapsed lung.

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