Motor vehicle collisions are the most common cause of<unk> .<unk>  is the most common injury found in blunt chest trauma, occurring in 25–35% of cases. It is usually caused by the rapid deceleration that results when the moving chest strikes a fixed object. About 70% of cases result from motor vehicle collisions, most often when the chest strikes the inside of the car. Falls, assaults, and sports injuries are other causes.<unk>  can also be caused by explosions; the organs most vulnerable to blast injuries are those that contain gas, such as the lungs. Blast lung is severe<unk> , bleeding, or edema with damage to alveoli and blood vessels, or a combination of these. This is the primary cause of death among people who initially survive an explosion. Unlike other mechanisms of injury in which<unk>  is often found alongside other injuries, explosions can cause<unk>  without damage to the chest wall. In addition to blunt trauma, penetrating trauma can cause<unk> .<unk>  resulting from penetration by a rapidly moving projectile usually surrounds the path along which the projectile traveled through the tissue. The pressure wave forces tissue out of the way, creating a temporary cavity; the tissue readily moves back into place, but it is damaged.<unk> s that accompany gun and knife wounds are not usually severe enough to have a major effect on outcome; penetrating trauma causes less widespread lung damage than does blunt trauma. An exception is shotgun wounds, which can seriously damage large areas of lung tissue through a blast injury mechanism.
Pulmonary contusion
Hemothorax
Pulmonary hematoma
Diaphragmatic rupture
Urinothorax
Hemopneumothorax
Hydropneumothorax
Flail chest