The severity of a head injury is assessed by the Glasgow Coma Scale (GCS), and TBI are divided into three groups: minor (13-15), moderate (9-12) , severe (3-8). Definition of TCC has considerably evolved over the past 20 years, to take into account the pathophysiologic lesions secondary is related to systemic factors (hypotension, hypoxia ...) and intracranial factors ( intracranial hypertension, seizures committals ...). These side events, occurring within hours or days after the primary injury caused by an impact (contusion, hematoma, deceleration), increase the morbidity of the initial event, and must therefore be detected both early and fully.