• Stereotact Funct Neurosurg · Jan 2014

    Single-institution retrospective series of gamma knife radiosurgery in the treatment of multiple sclerosis-related trigeminal neuralgia: factors that predict efficacy.

    • Michael Weller, Kopriva Marshall, James F Lovato, J Daniel Bourland, Allan F deGuzman, Michael T Munley, Edward G Shaw, Stephen B Tatter, and Michael D Chan.
    • Department of Radiation Oncology, Cleveland Clinic, Cleveland, Ohio, USA.
    • Stereotact Funct Neurosurg. 2014 Jan 1;92(1):53-8.

    BackgroundGamma knife radiosurgery (GKRS) has been reported as a treatment option for multiple sclerosis (MS)-related trigeminal neuralgia.ObjectiveTo report the outcomes of a single-institution retrospective series of MS-related trigeminal neuralgia.MethodsBetween 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.ResultsOf 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).ConclusionGKRS is a viable noninvasive treatment option for MS-related trigeminal neuralgia.

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