Abstract
A 17-year-old female high school student, suffered from attacks of vertigo after influenza vaccinations, which was diagnosed as vertigo consistent with vestibular neuronitis.
She was completely healthy until she noted some dizziness on arising from a chair, which subsided spontaneously one hour after resting. This was on the 20th day after the first influenza vaccination.
Two days after the first dizziness attack (22nd day after the first influenza vaccination), she began to have sudden, severe rotatory vertigo, 2 hours after the second vaccination. She had accompanying nausea and vomiting persisting for about half a day. Although the vertigo subsided she has developed unsteadiness of gait.
There were no signs or findings of cochlear nervous impairment. Otoneurological findings including the caloric test and galvanic body-sway test (computed galvanogram, Yamaguchi University) were consistent with that of vestibular neuronitis. Sero-immunological study revealed a low level of viral antibody titre.
The pathognomosis of vestibular neuronitis is briefly discussed.
