Traumatic pneumothorax occurs when a physical injury causes the lung to collapse. It can be the result of a blunt or penetrating chest injury (gunshot or knife wounds to the chest, automobile accidents), or can occur as a complication following certain medical procedures. High-risk medical procedures include transbronchial biopsy, pleural biopsy, thoracentesis, central venous catheter placement, intercostal needle anesthesia, and esophagoscopy. Traumatic pneumothorax is often accompanied by hemothorax (a collection of blood between the lung and chest wall).
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