Transcranial Doppler on Admission of Patients With Mild to Moderate Traumatic Brain Injury

Criteria for inclusion: * 15 years of age or more * primary admission for mild TBI (GCS 14-15) or moderate (GCS 9-13) TBI. * with or without multiple injury. * with no hemodynamic or respiratory distress: SAP \>90mmHg, SPO2 \>92%,hemoglobin \> 8 g/dl. * with mild brain lesions on CTscan according to the traumatic coma data bank classification (TCDB) II: diffuse injury with cisterns present and no midline shift, mixed density lesions \<25 ml. * Transcranial Doppler within 8 hours after the trauma. * patient affiliated to the social security system or equivalent Criteria for exclusion: * Severe TBI (GCS\<9) * Penetrating TBI * patient with no brain CT scan * patient with normal brain CT scan (TCDB I), or severe brain CT scan (TCDB III-IV) * Hemodynamic or respiratory distress * Patient treated with anticoagulants: oral anticoagulant, heparin, anti-platelet agent (except Aspirin) * previous intracranial surgery * Patient with sedation and mechanical ventilation * transcranial Doppler unable * patient deprived of freedom by judicial or administrative decision * Follow up at 7 days impossible * Refusal consent to use data for statistics