From an article in 2007, where it states that Dr. Jannetta first proposed vascular decompression in the brain for trigeminal neuralgia twenty years before it was finally accepted. Twenty years. Better late than never, I guess, and perhaps in our advanced technological age it won't be so long for us to determine whether vascular decompression is helpful for PD. Here's the link:

http://www.pittsburghlive.com/x/lead.../s_532004.html

For those not following Dr. Jannetta, he proposes that vascular compression upon the penducle may be a cause of PD and that decompressing that artery alleviates the PD. There are posts here on the forum about this if you care to learn more.