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Chris van der Linden asked: > It is very contradictory that the FDA has approved DBS for tremor > using part of the thalamus as a target, whereas going a few mm deeper into > the brain reaching the STN is not approved. This does't make sense to me. > Can somebody explain to me why the FDA is inconsistent? Chris, Because damage to the subthalamic nucleus can produce a syndrome called "hemiballismus" which is a terribly disabling condition associated with wild and uncontrollable movements of one side of the body. Hemiballismus is much worse than Parkinson's disease. Best, Bob ********************************************** Robert A. Fink, M. D., F.A.C.S., P. C. 2500 Milvia Street Suite 222 Berkeley, California 94704-2636 Telephone: 510-849-2555 FAX: 510-849-2557 WWW: <http://www.dovecom.com/rafink/> mailto:[log in to unmask] "Ex Tristitia Virtus" *********************************************