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Abnormal Head Impulse Test in a Unilateral Cerebellar Lesion
Journal of Clinical Neurology ; : 279-282, 2015.
Article in English | WPRIM | ID: wpr-96074
ABSTRACT

BACKGROUND:

The findings of head impulse tests (HIT) are usually normal in cerebellar lesions. CASE REPORT A 46-year-old male presented with progressive dizziness and imbalance of 3 weeks duration. The patient exhibited catch-up saccades during bedside horizontal HIT to either side, which was more evident during the rightward HIT. However, results of bithermal caloric tests and rotatory chair test were normal. MRI revealed a lesion in the inferior cerebellum near the flocculus.

CONCLUSIONS:

This case provides additional evidence that damage to the flocculus or its connections may impair the vestibulo-ocular reflex only during high-speed stimuli, especially when the stimuli are applied to the contralesional side. By observing accompanying cerebellar signs, the abnormal HIT findings caused by a cerebellar disorder can be distinguished from those produced by peripheral vestibular disorders.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Saccades / Reflex, Vestibulo-Ocular / Caloric Tests / Magnetic Resonance Imaging / Cerebellar Diseases / Cerebellum / Vertigo / Dizziness / Head Impulse Test Limits: Humans / Male Language: English Journal: Journal of Clinical Neurology Year: 2015 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Saccades / Reflex, Vestibulo-Ocular / Caloric Tests / Magnetic Resonance Imaging / Cerebellar Diseases / Cerebellum / Vertigo / Dizziness / Head Impulse Test Limits: Humans / Male Language: English Journal: Journal of Clinical Neurology Year: 2015 Type: Article