[Autoimmune encephalitis. New diagnosis for an old condition].

Autoimmune encephalitis is a new group of diseases of great clinical and therapeutic importance due to the good response in most cases to the immunomodulatory therapy indicated, with a large percentage of healing without significant neurological effects (cognitive, motor, seizures or involuntary movements). Since 2007, the presence of neuronal autoantibodies in the pathogenesis of this group of diseases has been demonstrated, with psychotic symptoms and involuntary movements as clinical markers of the disease. The present review emphasizes the crucial leap and change of paradigms arising after the discovery of these encephalitis associated with antibodies.