Single-Institution Retrospective Series of Gamma Knife Radiosurgery in the Treatment of Multiple Sclerosis-Related Trigeminal Neuralgia: Factors that Predict EfficacyWeller M.a · Marshall K.c · Lovato J.F.d · Bourland J.D.c · deGuzman A.F.c · Munley M.T.c · Shaw E.G.c · Tatter S.B.b · Chan M.D.c
aDepartment of Radiation Oncology, Cleveland Clinic, Cleveland, Ohio, and Departments of bNeurosurgery, cRadiation Oncology and dPublic Health Sciences, Wake Forest University Health Sciences, Winston-Salem, N.C., USA
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Article / Publication Details
Background: Gamma knife radiosurgery (GKRS) has been reported as a treatment option for multiple sclerosis (MS)-related trigeminal neuralgia. Objective: To report the outcomes of a single-institution retrospective series of MS-related trigeminal neuralgia. Methods: Between 2002 and 2010, 35 patients with MS-related trigeminal neuralgia were treated with GKRS. The median maximum dose was 90 Gy. Data were analyzed to determine the response to GKRS and factors that may predict for efficacy. Results: Of the 35 patients, 88% experienced a Barrow Neurological Institute (BNI) pain score of I-III at 3 months after GKRS. Kaplan-Meier estimates of 1-, 2- and 5-year freedom from BNI IV-V pain relapse were 57, 57 and 52%, respectively. Numbness was experienced by 39% of patients after GKRS, though no patients reported bothersome numbness. Several differences were noted between how the MS-related variant responded to GKRS and what has previously been reported for idiopathic trigeminal neuralgia. These include the observations that development of post-GKRS numbness did not predict for treatment response (p = 0.62) and that dorsal root entry zone dose did not predict for freedom from pain relapse (odds ratio 1.01, p = 0.1). Active smoking predicted for freedom from pain relapse (odds ratio 67.4, p = 0.04). Conclusion: GKRS is a viable noninvasive treatment option for MS-related trigeminal neuralgia.
© 2013 S. Karger AG, Basel
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