Schwannomas are benign neoplasms arising from Schwann cells (1). In 25% of cases, Schwannomas develop in the head and neck region, representing 8 to 10% of primary intracranial tumors, whereas they constitute less than 1% of tumors with intratemporal localization (2). The most frequent cranial nerve neuromas typically arise from the VIIIth or Vth cranial nerve. The facial nerve is less frequently involved, and approximately 90% of facial nerve schwannomas arise from the internal auditory canal segment, generally from the geniculate ganglion (3). Its exclusive presence at the level of the tympanic or the mastoid segments of the nerve is rare. Computed tomography and magnetic resonance imaging (MRI) represent important diagnostic tools for this type of tumor.
Imaging case of the month: facial nerve schwannoma.
Marchioni, Daniele;
2009-01-01
Abstract
Schwannomas are benign neoplasms arising from Schwann cells (1). In 25% of cases, Schwannomas develop in the head and neck region, representing 8 to 10% of primary intracranial tumors, whereas they constitute less than 1% of tumors with intratemporal localization (2). The most frequent cranial nerve neuromas typically arise from the VIIIth or Vth cranial nerve. The facial nerve is less frequently involved, and approximately 90% of facial nerve schwannomas arise from the internal auditory canal segment, generally from the geniculate ganglion (3). Its exclusive presence at the level of the tympanic or the mastoid segments of the nerve is rare. Computed tomography and magnetic resonance imaging (MRI) represent important diagnostic tools for this type of tumor.
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