Auditory brainstem implants (ABI) are designed to be applied in patients with lesions occurring between the cochlear and cochlear nuclei. As ABI were not widely performed in Korea so far, here we report a case of ABI. A 29-year-old woman, diagnosed of neurofibromatosis type II(NF2), who previously took right acoustic schwannoma removal via retrosigmoid approach and thoracic spinal Schwannoma removal , had severe bilateral hearing loss. Right side was deaf and left side pure tone average was 75dB. On auditory brainstem response test, both sides showed no response. Brain magnetic resonance imaging revealed 3cm , 3.5cm sized extra axial masses at bilateral cerebellopontine angle (Right, left consecutively). By tranlabyrinthine approach we co-operated with Neurosurgery department and removed the tumor on the left side and placed the electrode array near the lateral recess of 4th ventricle. After the surgery, we are closely observing the patient with continuous mapping of the ABI.
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