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To Phil Tompkins The Gamma Knife works great for inoperable tumors and AVM. But it is a hit or miss when it comes to PD. The problem is that the GK uses MRI to fix coordinates for placing a lesion for the pallidotomy or thalamotomy. First the MRI can have error as large as 7 mm. This is far enough to place the lesion in the optic track or in the internal capsule. Secondly, the correct place to place the lesion differs between patients. As such it is necessary to "find" the correct place by inserting a probe and either listen or apply electrical stimulation. This is impossible with a GK. My advice, avoid facilities that tell you how wonderful the GK can be. You could come out blind or hemiparaplegic or even OK. Regards, Alan Bonander