Dumbbell-Shaped Abducens Schwannoma: Case Report
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概要
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Schwannomas of the abducens nerve are uncommon. Nineteen cases have been reported in the literature and are classified into two types: Type 1, in the cavernous sinus, and Type 2, in the prepontine area. However, a dumbbell-shaped type has not yet been reported. Here we report the first case of a dumbbell-shaped abducens schwannoma and classify this type into a new category (Type 3). A 36-year-old woman presented with left hearing disturbance for 4 years, dizziness for 2 years, and dysphagia for 6 months. Neurological examination showed left sensorineural hearing impairment, hypesthesia in the distribution of the left first and second branches of the trigeminal nerve, left curtain sign, and gait disturbance. Computed tomography and magnetic resonance imaging revealed a dumbbell-shaped tumor located in the cavernous sinus that extended to the right cerebellopontine angle. She underwent a two-staged operation; the first operation was via ananterior transpetrosal approach for the lesion in the middle fossa and the upper part in the posterior fossa, and the second surgery was via alateral suboccipital approach for the lower part in the posterior fossa. In the first operation, the abducens nerve was sacrificed. Histological examination confirmed schwannoma. Postoperatively, hearing disturbance and ataxia were improved and complete abducens nerve paresis appeared. The dumbbell-shaped abducens schwannoma has novel clinical features, difficulty of sixth nerve preservation, and unique surgical approach.
- 社団法人 日本脳神経外科学会の論文
著者
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YOSHIDA Kazunari
Department of Neurosurgery, Keio University School of Medicine
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Yoshida Kazunari
Department Of Neurosurgery Keio University School Of Medicine
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SHIBAO Shunsuke
Department of Neurosurgery, Keio University School of Medicine
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HAYASHI Saeko
Department of Neurosurgery, Keio University School of Medicine
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Hayashi Saeko
Department of Chemistry, Faculty of Science and Engineering, Saga University
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