Immediate life threatening (6):
1. Tension pneumothorax
2. Open pneumothorax
3. Massive hemothorax
4. Pericardial tamponade
5. Flail chest
6. Airway obstruction
Potentially life threatening (6):
1. Aortic injuries
2. Tracheobronchial injuries
3. Oesophageal injuries
4. Pulmonary contusion
5. Myocardial contusion
6. Rupture of diaphragm
NOTE: The word 'dozen' is typically used to denote 12.