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Treatment of MRI-Diagnosed Trigeminal Peripheral Nerve Sheath Tumors by Stereotactic Radiotherapy in Dogs

  • Author(s): Hansen, KS
  • Zwingenberger, AL
  • Théon, AP
  • Pfeiffer, I
  • Kent, MS
  • et al.
Abstract

Copyright © 2016 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine. BACKGROUND: Stereotactic radiotherapy (SRT) is an emerging technique for treating tumors in animals.OBJECTIVES: To assess the outcome of dogs with suspected intracranial trigeminal nerve peripheral nerve sheath tumors (PNST) treated with SRT.ANIMALS: Eight dogs with presumptive PNST.METHODS: This was a retrospective study of dogs identified by searching UC Davis Veterinary Medical Teaching Hospital medical records for dogs treated with SRT for a presumed PNST. Presumptive diagnosis was based on magnetic resonance imaging. SRT was delivered in 3 dose fractions of 8 Gray (Gy) on consecutive days or every other day to a total dose of 24 Gy.RESULTS: Median disease-specific survival was 745 days (range: 99-1375 days, n = 6). No signs of acute adverse effects of radiation treatment were recorded. Late radiation effects versus tumor progression could not be confirmed histopathologically because of few animals undergoing necropsy.CONCLUSIONS AND CLINICAL IMPORTANCE: This study provides preliminary evidence that dogs with PNST benefit from SRT in terms of long-term survival. The treatment appears to be well tolerated and requires fewer anesthetic events for animals compared to full-course radiation.

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