{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T12:15:57Z","timestamp":1791288957862,"version":"4.3.0"},"reference-count":35,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2018,4]]},"abstract":"<jats:sec><jats:title>OBJECTIVE<\/jats:title><jats:p>Multiple sclerosis (MS) is a neurodegenerative disease that can lead to severe intention tremor in some patients. In several case reports, conventional radiotherapy has been reported to possibly exacerbate MS. Radiosurgery dramatically limits normal tissue irradiation to potentially avoid such a problem. Gamma Knife thalamotomy (GKT) has been established as a minimally invasive technique that is effective in treating essential tremor and Parkinson\u2019s disease\u2013related tremor. The goal in this study was to analyze the outcomes of GKT in patients suffering from medically refractory MS-related tremor.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>The authors retrospectively studied the outcomes of 15 patients (mean age 46.5 years) who had undergone GKT over a 15-year period (1998\u20132012). Fourteen patients underwent GKT at a median maximum dose of 140 Gy (range 130\u2013150 Gy) using a single 4-mm isocenter. One patient underwent GKT at a dose of 140 Gy delivered via two 4-mm isocenters (3 mm apart). The posteroinferior region of the nucleus ventralis intermedius (VIM) was the target for all GKTs. The Fahn-Tolosa-Marin clinical tremor rating scale was used to evaluate tremor, handwriting, drawing, and drinking. The median time to the last follow-up was 39 months.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>After GKT, 13 patients experienced tremor improvement on the side contralateral to surgery. Four patients noted tremor arrest at a median of 4.5 months post-GKT. Seven patients had excellent tremor improvement and 6 had good tremor improvement. Four patients noted excellent functional improvement, 8 noted good functional improvement, and 1 noted satisfactory functional improvement. Three patients experienced diminished tremor relief at a median of 18 months after radiosurgery. Two patients experienced temporary adverse radiation effects. Another patient developed a large thalamic cyst 60 months after GKT, which was successfully managed with Ommaya reservoir placement.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>Gamma Knife thalamotomy was found to be a minimally invasive and beneficial procedure for medically refractory MS tremor.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2017.1.jns162512","type":"journal-article","created":{"date-parts":[[2017,6,30]],"date-time":"2017-06-30T13:58:52Z","timestamp":1498831132000},"page":"1214-1221","source":"Crossref","is-referenced-by-count":11,"title":["Stereotactic radiosurgery for medically refractory multiple sclerosis\u2013related tremor"],"prefix":"10.3171","volume":"128","author":[{"given":"Sudesh S.","family":"Raju","sequence":"first","affiliation":[{"name":"University of Pittsburgh School of Medicine; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ajay","family":"Niranjan","sequence":"additional","affiliation":[{"name":"Departments of Neurological Surgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edward A.","family":"Monaco","sequence":"additional","affiliation":[{"name":"Departments of Neurological Surgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John C.","family":"Flickinger","sequence":"additional","affiliation":[{"name":"Radiation Oncology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. 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