Teaching Video NeuroImages: Macrosaccadic oscillations induced by horizontal head impulses

A 33-year-old woman experienced chronic dizziness for 2 years. Examination disclosed gaze-evoked nystagmus and hypermetric saccades. Macrosaccadic oscillations (MSOs) were induced by a gaze shift and horizontal head impulses (video at Neurology.org). Brain MRI demonstrated a large (3.8 x 3.9 x 5.3 cm3) epidermoid cyst at the fourth ventricle that compresses the brainstem and cerebellum (figure).
Source: Neurology - Category: Neurology Authors: Tags: MRI, Clinical neurology examination, Ocular motility, Vertigo, Primary brain tumor RESIDENT AND FELLOW SECTION Source Type: research