title: Impact of fundal extension on hearing after surgery for vestibular schwannomas.
abstract: OBJECTIVE
  To compare hearing preservation after surgery for intracanalicular vestibular schwannomas with or without fundal extension.
  
  
  METHODS
  Retrospective chart review.
  
  
  METHODS
  Patients with intracanalicular tumors (≤ 10-m maximal dimension) undergoing retrosigmoid craniotomy between 2001 and 2010.
  
  
  METHODS
  Preoperative and postoperative audiograms, preoperative magnetic resonance imaging, and operative reports were reviewed.
  
  
  METHODS
  Preoperative and postoperative hearing (American Academy of Otolaryngology-Head and Neck Surgery classification).
  
  
  RESULTS
  Complete data for 53 patients (27 female and 24 male subjects, sex was not recorded for 2 patients) meeting selection criteria was available. Fundal involvement was identified in 39 (73.6%) of the 53 patients. The remaining 14 patients did not have tumor with fundal extension (26.4%). Average tumor size for patients with fundal extension (+FE) was 6.9 ± 2.2 mm and without fundal extension (-FE) was 8.2 ± 1.9 mm (p = 0.05, Student's t test). Average preoperative speech discrimination score for the entire study was 90.5 ± 11.8 (n = 53). After retrosigmoid approach for tumor resection, 79% of patients (42/53) had preserved hearing defined as American Academy of Otolaryngology-Head and Neck Surgery class A, B, or C. Average postoperative speech discrimination score for these patients was 89.3 ± 12.1, and average postoperative pure-tone average was 35.9 ± 9.1%. Eighty-five percent (33/39) of +FE patients had preserved hearing (class A, B, or C). In contrast, 64% (9/14) of -FE patients had hearing preserved (class A, B, or C; Fisher's exact test, p = 0.034).
  
  
  CONCLUSIONS
  Hearing preservation rate after retrosigmoid craniotomy for intracanalicular vestibular schwannomas may be superior for tumors with fundal extension compared with tumors that do not extend to the fundus.
authors.affiliation: Division of Otolaryngology/Head and Neck, Kaiser Permanente, San Diego, California, USA. quyennguyen@ucsd.edu
authors.forename: Quyen T
authors.initials: QT
authors.lastname: Nguyen
authors.forename: Amy P
authors.initials: AP
authors.lastname: Wu
authors.forename: Bill J
authors.initials: BJ
authors.lastname: Mastrodimos
authors.forename: Roberto A
authors.initials: RA
authors.lastname: Cueva
mesh_terms: D000328:Adult; D000368:Aged; D001301:Audiometry, Pure-Tone; D001345:Autoradiography; D003399:Craniotomy; D005260:Female; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000473:pathology* / Q000601:surgery*; D013506:Otologic Surgical Procedures; D011182:Postoperative Care; D011183:Postoperative Complications / Q000453:epidemiology; D011184:Postoperative Period; D012189:Retrospective Studies; D013063:Speech Discrimination Tests; D016896:Treatment Outcome