 This kind of surgery can be both a thalamotomy or the implantation of a thalamic stimulator.Complications are frequent (30% in thalamotomy and 10% in deep brain stimulation) and include a worsening of ataxia, dysarthria and hemiparesis.Thalamotomy is a more efficacious surgical treatment for intractable MS tremor though the higher incidence of persistent neurological deficits in patients receiving lesional surgery supports the use of deep brain stimulation as the preferred surgical strategy.