United Brachial Plexus Network

My wife was recently diagnosed with BP, there are no tumors, no history of trauma(accidents, injuries, etc). This seems to have come on all of the sudden.. She had severe neck pain for about two weeks then a loss of strength in her right arm. Various tests indicates it is also affecting her left arm. What is the long term prognosis? Also, who do you feel is the preeminent physician/hospital in the US for a second opinion and or treatment?

Har