i learn so much here. all the info i get here leads me to alot of questioning. i wonder why my neurologist said that a pet scan would not be helpful. i plan to ask him at the next visit. if many folks are misdiagnosed, it makes sense to me that effective treatment needs to be tailored to the correct diagnosis. i would hate to be diagnosed as not having classic PD after i'm dead. also, is the reason pders are "like snowflakes" referring to our different symptoms & med response because we all have different diseases. How the heck can research & drug trials be accurate if the participants have all different illnesses that look similiar but are not one disease. just asking.