Vol.95 No.10 contentsPRACTICA OTO-RHINO-LARYNGOLOGICA
Vol. 95 No. 10 October 2002
Disorder of the Central Vestibular System Demonstrating
Impaired Visual Suppression of VOR
Yoshiko Shiomi, Yousaku Shiomi, Naoharu Oda and Mitsuko Fujihara
(Matsue City Hospital)
Three cases of central vertigo with impaired visual suppression (VS) of the vestibulo-ocular reflex (VOR) during manual sinusoidal rotation are presented. A 48-year-old woman consulted our clinic complaining of chronic vertigo for three years. There was no spontaneous nystagmus and routine equilibrium test did not demonstrate any abnormality, while VS of VOR was severely impaired. MRA demonstrated stenosis of the right vertebral artery. A 38-year-old man consulted our clinic due to acute vertigo persisting for one day. He showed left-beating spontaneous nystagmus without aural symptoms. Electronystagmography showed right canal paresis without remarkable findings suggesting central abnormality, while VS of VOR was severely impaired. MRI demonstrated a meningioma at the cerebello-pontine angle. A 58-year-old man was referred to our clinic with a one-month history of dizziness. He did not show any spontaneous nystagmus and there were no abnormal neurological findings. The equilibrium test was normal except for impaired optokinetic nystagmus, and VS of VOR was impaired. MRI demonstrated a hematoma at the left cerebellar peduncle. VS of VOR was thought to be a useful parameter for determining the necessity of further evaluation by MRI and MRA.
Key words : visual suppression, vertigo, vestibulo-ocular reflex