title: Establishing a method to predict the outcome of vestibular schwannoma surgery based on one's own results.
abstract: OBJECTIVE
  To establish a prognostication method based on our own results of vestibular schwannoma surgery.
  
  
  METHODS
  Retrospective data analysis.
  
  
  METHODS
  Tertiary referral centre.
  
  
  METHODS
  141 ambulatory patients operated for unilateral vestibular schwannoma by the translabyrinthine approach in the period 1996--2003.
  
  
  METHODS
  Facial impairment defined by House Brackmann grade III-VI, and the relation with tumor size.
  
  
  RESULTS
  For our institution we found that in a range of tumor sizes the tumor size of 17.5 mm was the cut-off point associated with highest sensitivity and specificity values available concerning the prediction of facial impairment, these were 0.86 and 0.61. Compared to a random cut-off point (11 mm), this leads to 36% more accurate predictions.
  
  
  CONCLUSIONS
  By establishing sensitivity and specificity values of predictions, one is aware of the rate of false predictions. By Receiver Operating Curve analysis the rate of false predictions can be minimised. In vestibular schwannoma surgery this leads to more precise predictions concerning outcome, as we have demonstrated for the facial function.
authors: Department of Otorhinolaryngology, Leiden University Medical Centre, Leiden, The Netherlands. d.hastan@lumc.nl
authors: D
authors: D
authors: Hastan
authors: W P
authors: WP
authors: Godefroy
authors: M J A
authors: MJ
authors: Malessy
authors: A G L
authors: AG
authors: van der Mey
mesh_terms: D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000175:diagnosis / Q000601:surgery*; D013506:Otologic Surgical Procedures / Q000379:methods*; D010045:Outpatients; D011379:Prognosis; D012372:ROC Curve; D012189:Retrospective Studies