Because after pallidotomy, especially on one side, one requires more medication for several reasons, it is quite understandable that dyskinesias enhance, particularly on the non-operated side. Either you should have another surgery on the other side, in this case pallidal stimulation, or STN stimulation on both sides, which will significantly reduce the medication dosage. Chris van der Linden, M.D. St. Lucas Hospital Ghent Ghent, BELGIUM