Related Experiment Video
Updated: Mar 27, 2026
08:38
Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
Published on: April 18, 2019
33.3K
Bilaterally Abnormal Head Impulse Tests Indicate a Large Cerebellopontine Angle Tumor
Hyo Jung Kim1, Seong Ho Park2, Ji Soo Kim3
1Department of Biomedical Laboratory Science, Kyungdong University, Goseong, Korea.
Journal of Clinical Neurology (Seoul, Korea)
|January 13, 2016
Summary
Head impulse tests (HITs) can indicate large cerebellopontine angle (CPA) tumors. Bilaterally abnormal HITs suggest a larger tumor, potentially reducing the need for frequent brain scans.
Area of Science:
- Neuroscience
- Ophthalmology
- Otolaryngology
Background:
- Cerebellopontine angle (CPA) tumors present diagnostic challenges.
- Vestibulo-ocular reflex (VOR) function is assessed using head impulse tests (HITs).
- Limited research exists on VOR head impulse gain in vestibular schwannoma patients.
Purpose of the Study:
- To determine if VOR head impulse gain indicates the size of unilateral CPA tumors.
- To investigate the relationship between tumor size and VOR head impulse gain.
Main Methods:
- Twenty-eight unilateral CPA tumor patients underwent HITs recorded via magnetic search coil.
- Patients were classified into non-compressing (T1-T3) and compressing (T4) groups.
- Analysis focused on head impulse gain of the VOR.
Main Results:
- 82% of patients exhibited abnormal HITs on the lesion side.
- Compressing tumors showed significantly more bilateral HIT abnormalities (80% vs. 8%).
- Tumor size inversely correlated with VOR head impulse gain.
Conclusions:
- Bilaterally abnormal HITs suggest a large unilateral CPA tumor.
- Contralesional HIT abnormalities may stem from adaptation or brainstem/cerebellar compression.
- Serial HIT evaluation may monitor tumor growth and reduce imaging costs.
