Collapsed lung or pneumothorax is an accumulation of air in the chest causing the lung to separate from the chest wall.

Collapsed lung may also refer to:

• Atelectasis, collapse of the air-containing sacs of the lung
• Collapsed Lung (band), a British hip-hop band

• Flail chest, a condition sometimes producing and often confused with pneumothorax

This disambiguation page lists articles associated with the title Collapsed lung.
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