A<unk>  is a life-threatening medical condition that occurs when a segment of the<unk>  wall breaks under extreme stress and becomes detached from the rest of the<unk>  wall. It occurs when multiple adjacent ribs are broken in multiple places, separating a segment, so a part of the<unk>  wall moves independently.  The number of ribs that must be broken varies by differing definitions: some sources say at least two adjacent ribs are broken in at least two places, some require three or more ribs in two or more places.  The<unk>  segment moves in the opposite direction as the rest of the<unk>  wall: because of the ambient pressure in comparison to the pressure inside the lungs, it goes in while the rest of the<unk>  is moving out, and vice versa. This so-called "paradoxical motion" can increase the work and pain involved in breathing. Studies have found that up to half of people with<unk>  die.<unk>  is invariably accompanied by pulmonary contusion, a bruise of the lung tissue that can interfere with blood oxygenation. Often, it is the contusion, not the<unk>  segment, that is the main cause of respiratory<unk> ure in patients with both injuries.
Flail chest
Diaphragmatic rupture
Hemothorax
Urinothorax
Pulmonary contusion
Chylothorax
Trapped lung
Pneumopericardium