Dumbbell-shaped abducens schwannoma

Case report

Shunsuke Shibao, Saeko Hayashi, Kazunari Yoshida

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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 classifiy 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 f rst 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.

Original languageEnglish
Pages (from-to)331-336
Number of pages6
JournalNeurologia Medico-Chirurgica
Volume54
Issue number4
DOIs
Publication statusPublished - 2014

Fingerprint

Neurilemmoma
Abducens Nerve
Cavernous Sinus
Hearing
Cerebellopontine Angle
Trigeminal Nerve
Hypesthesia
Neurologic Examination
Dizziness
Paresis
Ataxia
Deglutition Disorders
Gait
Hearing Loss
Tomography
Magnetic Resonance Imaging
Neoplasms

Keywords

  • Abducens schwannoma
  • Classification
  • Dumbbell-shaped

ASJC Scopus subject areas

  • Clinical Neurology
  • Surgery
  • Medicine(all)

Cite this

Dumbbell-shaped abducens schwannoma : Case report. / Shibao, Shunsuke; Hayashi, Saeko; Yoshida, Kazunari.

In: Neurologia Medico-Chirurgica, Vol. 54, No. 4, 2014, p. 331-336.

Research output: Contribution to journalArticle

Shibao, Shunsuke ; Hayashi, Saeko ; Yoshida, Kazunari. / Dumbbell-shaped abducens schwannoma : Case report. In: Neurologia Medico-Chirurgica. 2014 ; Vol. 54, No. 4. pp. 331-336.
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