All the patients admitted in emergency department for minor traumatized cranial, with antiplatelet therapy, can be included, after checked inclusion and non inclusions criterias. If they are agree, a blood sample for the dosage of S100b will be done. No other modification of the medical care, all patients will have tomodensitometria, according with recommendations. The aim of the study is to validate the negative predictive value of S100b in this population.
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Brain scanner Detection of a cerebral lesion requiring a surgery or medical intervention or an hospitalisation for a patient who have serum level of S100B protein with the treshold of 0.105 μg/L
Timeframe: 3 hours