Abnormal Head Impulse Test in a Unilateral Cerebellar Lesion.
10.3988/jcn.2015.11.3.279
- Author:
Seol Hee BAEK
1
;
Jeong Yoon CHOI
;
Jin Man JUNG
;
Do Young KWON
;
Moon Ho PARK
;
June CHOI
;
Ji Soo KIM
Author Information
1. Department of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
- Publication Type:Case Report
- Keywords:
vertigo;
flocculus;
head impulse test;
vestibulo-ocular reflex
- MeSH:
Caloric Tests;
Cerebellar Diseases;
Cerebellum;
Dizziness;
Head Impulse Test*;
Humans;
Magnetic Resonance Imaging;
Male;
Middle Aged;
Reflex, Vestibulo-Ocular;
Saccades;
Vertigo
- From:Journal of Clinical Neurology
2015;11(3):279-282
- CountryRepublic of Korea
- Language:English
-
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.
