Report of 11 cases with neurological sequelae after rachianesthesia. The neurological symptoms were: root pains, sexual impotence, weakness of the lower limbs and sphincter disturbances. None of these patients had any neurological symptom before the administration of spinal anesthetic. Eight patients presented spina bifida occulta without neurological signs. Of the 3 cases with normal roentgenogram one had enuresis until 18 years old. The authors suggest that clinical and roentgenogram studies should be done before each rachianesthesia procedure.