Journal
JOURNAL OF NEUROSURGERY
Volume 109, Issue 1, Pages 144-148Publisher
AMER ASSOC NEUROLOGICAL SURGEONS
DOI: 10.3171/JNS/2008/109/7/0144
Keywords
cerebellopontine angle; facial nerve; intermediate nerve; neurophysiological monitoring; schwannoma; vestibular nerve
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The intermediate nerve is seldom identified as the site of tumor origin in cerebellopontine angle schwannomas. A 29-year-old man presented with a 6-month history of slowly progressive hearing loss and dizziness; facial nerve weakness was not observed clinically. Magnetic resonance imaging revealed a tumor in the left cerebellopontine angle region extending up to the geniculate ganglion and along the course of the superficial petrosal nerve. A CT scan showed enlargement of the facial nerve canal. Microsurgery was performed via an extended retrosigmoid approach. Intraoperative and electrophysiological findings identified the intermediate nerve as the site of tumor origin.
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