Neurological affection exist in Behcet’s disease from 10 to 20% of the cases. This frequency increases if we practice a rachicentesis in systemic way. Any part of the central nervous system may be affected from which the great clinical polymorphism. Seems particulary prevalent in our study which concerns sixteen patients [the increased intracranial hypertension] . It’s present in sixty two and half per cent [62, 5%] of the cases of our serie while in the literature it’s only twenty per cent [20%] of the cases. Though the prognosis consired in case of neurological lesion pejorative either in the functional and the vital plan seems neatly improved these last years. The mortality is only notified in five per cent of the cases. The serious forms are always the encephalo-myelitis or the meningoencephalitis. The etiopathogenesis doubt explains the various therapeutics used