Present in 25% of patients with chest trauma
Communication between pleural space and atmospheric pressure (sucking chest wound)
Positive pressure ventilation (e.g. intubation) can convert an occult pneumothorax to a tension pneumothorax
Traumatic pneumothorax
Tension pneumothorax
Spontaneous pneumothorax
Hemothorax
Catamenial pneumothorax
Pulmonary contusion
Iatrogenic pneumothorax
Chylothorax