title: Cellular schwannoma of the greater superficial petrosal nerve presenting with abducens nerve palsy and xerophthalmia: case report.
abstract: OBJECTIVE
  Cellular schwannomas (CS) are rare in the cranial space. This report is the first of a patient with a greater superficial petrosal nerve CS presenting with abducens nerve palsy and xerophthalmia.
  
  
  METHODS
  A 16-year-old female patient presented with a 1-month history of diplopia. Neurological examination was normal except for the presence of right abducens nerve palsy. Schirmer's test revealed decreased tear secretion in the right eye. Computed tomography and magnetic resonance imaging showed a mass in the right petrous apex. It was thought that the schwannoma in our patient originated from the greater superficial petrosal nerve, based on the location of the tumor in addition to the absence of partial Horner's syndrome and a persistent decrease in tear secretion.
  
  
  METHODS
  The tumor was exposed with the use of a right subtemporal extradural approach and removed entirely. Pathological evaluation of the tumor revealed a CS.
  
  
  CONCLUSIONS
  The abducens nerve palsy improved completely in the follow-up period, but the decreased tear secretion did not resolve. CS is one of the subtypes of ordinary schwannomas and exhibits malignant features on microscopic examination, although it has a good clinical prognosis. No adjuvant treatment was applied because of the tumor's benign character. The greater superficial petrosal nerve schwannoma should be considered in the differential diagnosis of the abducens nerve palsy and petrous apex mass.
authors.affiliation: Department of Neurosurgery, Ankara Ataturk Training and Research Hospital, Bilkent, Turkey. giyas67@hotmail.com
authors.forename: Giyas
authors.initials: G
authors.lastname: Ayberk
authors.forename: Mehmet F
authors.initials: MF
authors.lastname: Ozveren
authors.forename: Nuket
authors.initials: N
authors.lastname: Uzum
authors.forename: Ozgur
authors.initials: O
authors.lastname: Tosun
authors.forename: Emine K
authors.initials: EK
authors.lastname: Akcay
mesh_terms: D020434:Abducens Nerve Diseases / Q000209:etiology*; D000293:Adolescent; D005154:Facial Nerve / Q000473:pathology* / Q000601:surgery; D005155:Facial Nerve Diseases / Q000209:etiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009442:Neurilemmoma / Q000150:complications* / Q000175:diagnosis / Q000601:surgery*; D019635:Neurosurgical Procedures / Q000379:methods; D035583:Rare Diseases; D020127:Recovery of Function; D014057:Tomography, X-Ray Computed; D014985:Xerophthalmia / Q000209:etiology*