Table 1. Etiology and lesions for the dissociation between caloric tests and vHITs.
| Peripheral lesions (n=105) | Central lesions (n=18) | |
|---|---|---|
| Abnormal caloric test group (n=123) | ||
| Unilateral caloric paresis (n=118) | n=101 | n=17 |
| Meniere's disease (n=58) | Stroke (n=7) | |
| Definite (n=51) | Brainstem infarction (n=6) | |
| Possible (n=7) | Cerebellar infarction (n=1) | |
| Inflammation (n=29) | Inflammation (n=4) | |
| Acute VN/labyrinthitis (n=7) | Meningoencephalitis (n=4) | |
| Subacute VN/labyrinthitis (n=2) | Degeneration or tumor (n=4) | |
| Chronic VN/labyrinthitis (n=20) | Cerebellar ataxia (n=2) | |
| Others (n=5) | Toxic cerebellar degeneration (n=1) | |
| Labyrinthine concussion (n=3) | Vestibular schwannoma (n=1) | |
| Vestibular schwannoma (n=1) | Undetermined cause (n=2) | |
| Toxic vestibulopathy (n=1) | ||
| Undetermined cause (n=9) | ||
| Bilateral caloric paresis (n=5) | n=4 | n=1 |
| Meniere's disease (n=4) fulfilling the criteria for BVP | Degeneration (n=1) | |
| Definite (n=2) | Cerebellar ataxia (n=1) | |
| Possible (n=2) |
BVP which only refers to conditions with caloric unresponsiveness (<20°/s for the sum of four absolute slow-eye velocities) or decreased bilateral horizontal vHIT gain (<0.6) in the absence of central pathology.
BVP: bilateral vestibulopathy, vHIT: video head impulse test, VN: vestibular neuritis.