title: Intracranial schwannomas of the lower cranial nerves.
abstract: OBJECTIVE
  To present our experience in the diagnosis and management of 39 patients with lower cranial nerve schwannomas of the posterior fossa.
  
  
  METHODS
  A retrospective chart review of patient medical records.
  
  
  METHODS
  Tertiary care, academic medical center.
  
  
  METHODS
  All patients with intracranial lower cranial nerve schwannomas treated surgically in our institution between July 1998 and July 2005.
  
  
  METHODS
  A retrosigmoid, transcondylar, or combined approach was used for tumor recurrence.
  
  
  RESULTS
  Thirty-nine patients underwent surgical resection, with complete tumor removal in 32, near-total resection in 5 patients, and subtotal tumor excision in 2 patients. Long-term (mean, 8.2 years) magnetic resonance imaging surveillance demonstrated recurrent tumor in 2 of 32 complete resections and slow regrowth in 2 of 7 patients with known residual disease. Only one of these four patients required reoperation.
  
  
  CONCLUSIONS
  Intracranial schwannomas of the lower cranial nerves are relatively uncommon and may present with subtle or no clinical symptoms. Successful surgical resection with low risk of tumor recurrence can be achieved with the retrosigmoid or transcondylar approach. Morbidity, in this series, was primarily related to lower cranial nerve deficits.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Loyola Center for Cranial Base Surgery, Loyola University Medical Center, Maywood, Illinois 60153, USA. jleonet@lumc.edu
authors.forename: John P
authors.initials: JP
authors.lastname: Leonetti
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Anderson
authors.forename: Sam J
authors.initials: SJ
authors.lastname: Marzo
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Origitano
authors.forename: Mobeen
authors.initials: M
authors.lastname: Shirazi
mesh_terms: D000328:Adult; D000368:Aged; D002533:Cerebral Angiography; D003388:Cranial Fossa, Posterior; D003390:Cranial Nerve Neoplasms / Q000175:diagnosis / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis / Q000601:surgery*; D009442:Neurilemmoma / Q000175:diagnosis / Q000601:surgery*; D013517:Otorhinolaryngologic Surgical Procedures; D012086:Reoperation; D012189:Retrospective Studies; D019292:Skull Base Neoplasms / Q000175:diagnosis / Q000601:surgery*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome