["Top of the basilar" syndrome].

Three cases of "Top of the basilar" syndrome are reported. The clinical manifestations included the consciousness disturbance, pupillary and oculomotor abnormalities. One of the 3 cases got cortical blindness. It is emphasized that the possibility of the TOB syndrome should be considered when unconsciousness arose suddenly, accompanied by lid, pupil and oculomotor disturbances without the motor and sensory disturbances. Usually, a bilateral symmetric butterfly hypodensity could be found in the thalamus on CT scan. In addition. It was valuable findings that the infarct lesions have been shown in the mesencephalon, pons, cerebellum, occipital and medial temporal lobe on CT scans.