Videonystagmography (VNG) caloric test showing a canal paresis (unilateral weakness) of >25% on Jongkees formula indicates:

• A Central vestibular pathway lesion
• B Ipsilateral peripheral vestibular hypofunction ✓
• C Superior canal dehiscence
• D Otolith dysfunction on the tested side

Explanation

Caloric testing isolates the horizontal semicircular canal; a canal paresis (unilateral weakness) exceeding 25% using Jongkees formula indicates reduced excitability of the ipsilateral labyrinth or vestibular nerve, consistent with peripheral vestibular hypofunction (e.g., vestibular neuritis, labyrinthitis, or acoustic neuroma). Central lesions produce directional preponderance rather than canal paresis. Superior canal dehiscence affects high-frequency hearing and produces low-threshold VEMPs, not caloric abnormality.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.