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TO THE EDITOR: We read with interest the article by Raju et al.8 on stereotactic radiosurgery for medically refractory multiple sclerosis tremor (Raju SS, Niranjan A, Monaco EA III, et al: Sterotactic radiosurgery for medically refractory multiple sclerosis–related tremor. J Neurosurg 128:1214–1221, April 2018).
Historically, this neurosurgery was first described and performed by Spiegel and Wycis,10,11 followed by Narabayashi,6 Obrador,7 Riechert,9 and others, with satisfactory result. During the “down time” for functional stereotaxy, progress was being made in diagnosis and anatomical localization using CT