Of the cerebral vascular lesions that can be treated with intravascular detachable balloon techniques, carotid-cavernous sinus fistulas and vertebro-vertebral fistulas have the best results. The great advantage of this technique is that the cerebral blood flow can usually be preserved after the occlusion of the fistula. The authors report 17 postraumatic carotid-cavernous sinus fistulas successfully treated with preservation of the carotid blood flow in 12 cases. None of the patients died, and the morbidity was limited to one case of third nerve palsy. The treatment of aneurysms by this method is, however, much more difficult and dangerous. Of 14 cases treated, seven good results were obtained. Two patients died and two had a poor outcome. The embolization of certain brain angiomas with calibrated-leak balloons using bucrylate promises to be important in the future.