Immediate emergency care is imperative to diagnosing and effectively treating traumatic brain injuries. In cases of less severe brain injuries, such as a mild concussion, the injured victim will usually be treated and released from an emergency facility. If the injury is more severe, however, an injured victim may require extensive and expensive medical treatments, extended hospitalization, and long-term rehabilitation. In extreme cases, a traumatic brain injury victim may fall into a coma, a minimally responsive state, a vegetative state, or even die.