Pneumothorax: Free air in the chest outside the lung. Pneumothorax can occur spontaneously, follow a fractured rib or other trauma, occur in the wake of chest surgery, or be deliberately induced in order to collapse the lung.

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Pneumothorax: Free air in the chest outside the lung. Pneumothorax can occur spontaneously, follow a fractured rib or other trauma, occur in the wake of chest surgery, or be deliberately induced in order to collapse the lung.