Spontaneous pneumothorax may occur in an apparently healthy person in the absence of trauma due to rupture of an air-filled bleb. The cause leads to the identification of the type of pneumothorax. When positive pressure has entered the pleural space, the lung or a portion of it collapses. When either pleura is breached, air enters the pleural space. The negative pressure is required to maintain lung inflation. The pathophysiology of pneumothorax include: A tension pneumothorax occurs when air is drawn into the pleural space from a lacerated lung or through a small opening or wound in the chest wall. A traumatic pneumothorax occurs when air escapes from a laceration in the lung itself and enters the pleural space or from a wound in the chest wall. A simple or spontaneous pneumothorax occurs when air enters the pleural space through a breach of either the parietal or visceral pleura. Types of pneumothorax include simple, traumatic, and tension pneumothorax
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