Both pallidotomy and stimulation surgery are invasive, but pallidotomy is destructive, whereas stimulation is reversible and adjustable. Surgery for stimulation takes longer and is valid primarily for tremor, not for other PD symptoms. In our experience and according to the data, VIM is the surgery of choice for tremor control. Messing around in the brain takes faith, whatever kind of messing around is chosen. Joanne Sandstrom [log in to unmask] Don, 58, 21 yrs.