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Journal of Neuro-Oncology

, Volume 131, Issue 1, pp 177–183 | Cite as

Stereotactic radiosurgery for non-vestibular cranial nerve schwanommas

  • Myreille D’Astous
  • Allen L. Ho
  • Arjun Pendharkar
  • Clara Y. H. Choi
  • Scott G. Soltys
  • Iris C. Gibbs
  • Armine T. Tayag
  • Patricia A. Thompson
  • John R. Adler
  • Steven D. Chang
Clinical Study

Abstract

Non-vestibular cranial nerve schwannomas (NVCNS) are rare lesions, representing <10 % of cranial nerve schwannomas. The optimal treatment for NVCNS is often derived from vestibular schwannomas experience. Surgical resection has been referred to as the first line treatment for those benign tumors, but significant complication rates are reported. Stereotactic radiosurgery (SRS) has arisen as a mainstay of treatment for many benign tumors, including schwanommas. We retrospectively reviewed the outcomes of NVCNS treated by SRS to characterize tumor control, symptom relief, toxicity, and the role of hypo-fractionation of SRS dose. Eighty-eight (88) patients, with ninety-five (95) NVCNS were treated with either single or multi-session SRS from 2001 to 2014. Local control was achieved in 94 % of patients treated (median follow-up of 33 months, range 1–155). Complications were seen in 7.4 % of cases treated with SRS. At 1-year, 57 % of patients had improvement or resolution of their symptoms, while 35 % were stable and 8 % had worsening or increased symptoms. While 42 % received only one session, results on local control were similar for one or multiple sessions (p = 0.424). SRS for NVCNS is a treatment modality that provides excellent local control with minimal complication risk compared to traditional neurosurgical techniques. Tumor control obtained with a multi-session treatment was not significantly different from single session treatment. Safety profile was also comparable for uni or multi-session treatments. We concluded that, as seen in VS treated with CK SRS, radiosurgery treatment can be safely delivered in cases of NVCNS.

Keywords

Stereotactic radiosurgery Schwannoma Cranial nerve Tumors 

Notes

Compliance with ethical standards

This study is an institutional board Approved, retrospective review of a prospectively maintained database. We obtained informed consent from all patients included in that study. Dr Scott G Soltys is a consultant for Nektar Therapeutics

Conflict of interest

All the other authors had no conflict of interest direct to declare.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Myreille D’Astous
    • 1
    • 3
  • Allen L. Ho
    • 1
  • Arjun Pendharkar
    • 1
  • Clara Y. H. Choi
    • 2
  • Scott G. Soltys
    • 2
  • Iris C. Gibbs
    • 2
  • Armine T. Tayag
    • 1
  • Patricia A. Thompson
    • 1
  • John R. Adler
    • 1
  • Steven D. Chang
    • 1
  1. 1.Department of Neurosurgery, Stanford University Medical CenterStanford Cancer InstituteStanfordUSA
  2. 2.Department of Radiation Oncology, Stanford University Medical CenterStanford Cancer InstituteStanfordUSA
  3. 3.Department of Surgery, CHU de QuébecUniversité LavalQuebec CityCanada

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