According to the Centers for Disease Control, there are at least 1.7 million traumatic brain injuries every year and a contributing factor in about a third of all injury-related deaths in the United States.
A traumatic brain injury may result in a subdural hematoma, which is when blood gathers between the dura and cerebral tissue. The hematoma formed by the collecting blood puts pressure on the brain, which can lead to serious injury or even death.