Dorsal displacement of the facial nerve in acoustic neuroma surgery: clinical features and surgical outcomes of 21 consecutive dorsal pattern cases

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• 作者：Takahide Nejo ; Michihiro Kohno ; Osamu Nagata ; Shigeo Sora…
• 关键词：Acoustic neuroma ; Facial nerve ; Intraoperative monitoring ; Lateral suboccipital approach ; Retrosigmoid approach ; Vestibular schwannoma
• 刊名：Neurosurgical Review
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：39
• 期：2
• 页码：277-288
• 全文大小：1,084 KB
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• 作者单位：Takahide Nejo (1)
  Michihiro Kohno (1)
  Osamu Nagata (2)
  Shigeo Sora (1)
  Hiroaki Sato (1)
  
  1. Department of Neurosurgery and Stroke Center, Tokyo Metropolitan Police Hospital, 4-22-1, Nakano, Nakano-ku, Tokyo, 164−8541, Japan
  2. Department of Anesthesiology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Neurosurgery
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1437-2320

文摘

In acoustic neuroma surgery, the facial nerve (FN) course varies among patients, but a dorsal pattern is rarely observed. We retrospectively reviewed and classified 556 acoustic neuromas operated on via a lateral suboccipital retrosigmoid (LSO) approach into two groups: dorsal (group D) and non-dorsal (group ND). The clinical features and outcomes including functional preservation of the FN, the extent of tumor resection, and the retreatment rate were compared. Among 556 cases, 21 (3.8 %) patients with dorsal patterns were identified. No significant differences in clinical features or preoperative status were noted between groups D and ND. No significant differences in functional FN preservation were found between groups D and ND in the immediate postoperative period (90.5 and 83.0 %, respectively) or 1-year postoperatively (95.2 and 97.0 %, respectively). Compared with group ND, the extent of tumor resection was significantly less (p < 0.0001) and the retreatment rate was significantly higher in group D (hazard ratio, 33.6; 95 % confidence interval [CI], 11.7–96.1; p < 0.0001). In one dorsal pattern case, surgical resection was abandoned based on the intraoperative findings. Dorsal displacement of the FN was accurately predicted with preoperative imaging evaluations in just two cases. Functional preservation of the FN during acoustic neuroma surgery is achievable if the FN runs along the dorsal side of the tumor. However, a dorsal pattern, especially when the FN is broadened, is clearly associated with less complete tumor removal and a higher rate of retreatment than typical pattern cases.