Abstract
The patient, a 27-year-old female, showed remarkable fluctuations in audiological findings during the period of 4 years of treatment, which included one V-P shunt operation and 3-time tumor exstirpation by suboccipital craniotomy. The threshold for continuous pure tones fluctuate from normal to complete loss, speech discriminations from 95% to 0%, the TTS from (-) to (+) and sometimes discrepancies between speech discrimination and TTS were found. Even when the patient showed a normal audiogram, very good discrimination and negative TTS, a decruitment phenomenon and loss of tonality was found in the lower frequency range. Some hazards of overlooking the presence of retrocochlear lesions were discussed.
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