[Tolosa-Hunt syndrome: current clinical and electrophysiologic evaluation]

Three patients with Tolosa-Hunt syndrome were reported. All clinical investigations were negative in two of them, apart from the orbital venography, which showed on the affected side, an obstruction of the superior ophthalmic vein in its third segment. In the third case, early subclinical optic nerve involvement were demonstrated and followed up by visual evoked responses to checker-board pattern stimuli.