title: Prevention and management of cerebrospinal fluid leak following vestibular schwannoma surgery.
abstract: OBJECTIVE
  Postoperative cerebrospinal fluid (CSF) leak is reported in 2% to 30% of cases following vestibular schwannoma surgery. The authors' current surgical techniques for translabyrinthine, retrosigmoid transmeatal, and middle cranial fossa approaches have evolved from analysis of their prior experience in an effort to minimize their complication rate. The authors evaluated the efficacy of their current surgical technique in decreasing the postoperative CSF leak rate.
  
  
  METHODS
  Retrospective review.
  
  
  METHODS
  The vestibular schwannoma database from the New York University Medical Center (New York, NY) neurotological service was reviewed. Data were extracted for type of approach, tumor size, and CSF leak rate. Liberal leak criteria were used. Surgical techniques and management of CSF leak were reviewed.
  
  
  RESULTS
  Data from 215 patients who had surgery from 1995 to 2000 manifested a 6.6% CSF leak rate for primary surgeries. This compared favorably with the authors' 17% overall CSF leak rate in 555 total primary surgeries performed between 1979 and 1995. Translabyrinthine closure was performed with dural sutures used as a sling across the posterior fossa dura and abdominal fat placed as a series of corks through the sutures. Abdominal fat was used to obliterate the mastoid cavity in conjunction with aditus and mastoid obliteration. Attention must be paid to soft tissue obliteration of potentially open air cell tracts. Retrosigmoid transmeatal closure was performed with a soft tissue graft in the internal auditory canal drill-out held in position by a "saloon-door" dural flap. Bone wax was used to block perimeatal cells in all cases. Watertight dural closure was achieved with a sutured temporalis fascia graft. Abdominal fat obliteration of the mastoidectomy cavity was performed with an additional firm pressure from the "Palva" periosteal flap. Middle cranial fossa closure was performed with attention to potential air cell tracts of the internal auditory canal drill-out, as well as abdominal fat graft, tissue glue, and bone wax. Fibrin glue was used in all approaches to temporarily secure fat in situ. Management of CSF leaks starts with nonoperative measures including bed rest, oversewing of incisional wounds, and placement of a lumbar subarachnoid spinal fluid diversion drain. If these conservative measures fail, repeat exploration is necessary and is directed at identifying and corking the cell or cells (usually perimeatal or perilabyrinthine) opening directly into the posterior fossa.
  
  
  CONCLUSIONS
  Evolution in surgical techniques, with particular attention to exposed air cell tracts, abdominal fat graft, and Palva periosteal flap for closure, has had a significant effect in decreasing the author's CSF leak rate after vestibular schwannoma surgery. Conservative management was successful in approximately 50% of cases. Repeat exploration, when needed, was directed at blocking the air cell tract (usually perimeatal or perilabyrinthine) responsible for the CSF leak.
authors.affiliation: Department of Otolaryngology, New York University School of Medicine, New York, New York 10016, USA.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Fishman
authors.forename: Michelle S
authors.initials: MS
authors.lastname: Marrinan
authors.forename: John G
authors.initials: JG
authors.lastname: Golfinos
authors.forename: Noel L
authors.initials: NL
authors.lastname: Cohen
authors.forename: J Thomas
authors.initials: JT
authors.lastname: Roland
mesh_terms: D002558:Cerebrospinal Fluid Otorrhea / Q000209:etiology / Q000517:prevention & control*; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D008297:Male; D009464:Neuroma, Acoustic / Q000601:surgery*; D013517:Otorhinolaryngologic Surgical Procedures / Q000379:methods; D011183:Postoperative Complications / Q000209:etiology / Q000517:prevention & control*; D012189:Retrospective Studies; D013524:Surgical Flaps