Abstract
A 53-year-old woman complained of recurrent attacks of vertigo with right-sided hearing loss and tinnitus. She was found to have a mild sensorineural hearing loss, right-sided vestibular weakness, and dominant negative SP on electrocochleography, but X-ray by the Stenvers method showed no enlargement of the right internal acoustic meatus. The initial diagnosis was Meniere's disease. After being symptom-free for three years and eight months, dizziness recurred and an acoustic tumor was discovered on a CT scan. The tumor was completely removed by the posterior fossa approach. The tumor originated from the superior vestibular nerve. Compression of the labyrinthine artery by the tumor was thought to have caused secondary endolymphatic hydrops in the initial stage.
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