Prevost’s Sign

Prevost’s Sign

Also known as Vulpian’s sign, this refers to the acute and transient gaze palsy in a frontal lesion (e.g., infarct) which is toward the side of the lesion and away from the concurrent hemiparesis. The eyes can be brought to the other side with the oculocephalic maneuver or caloric testing. In contrast, thalamic and basal ganglia hemorrhages produce forced deviation of the eyes to the side contralateral to the lesion (wrong-way eyes).