The conclusion is that the operation can help intention tremor, at least temporarily, but the risk of exacerbating other symptoms is present, at any rate when the patients are suffering from a relatively active form of multiple sclerosis. If the disease is of long standing, with relatively oligosymptomatic symptoms, thalamotomy may possibly be performed in order to relieve a severe intention tremor. It would seem that some reserve should be shown in employing this operation.