My Dad has been having problems with his leg muscles for about 4 years now. He has run the gammot of tests and everything has come back normal. Now the doctors are telling him that they feel like it might be PLS. How long can it take to get a confirmed diagnosis? It seems so rare that it is difficult not to be skeptical of the diagnosis. He is very depressed already from all of the years with no answers. It doesn't seem like he will be getting any anytime soon. I would appreciate if anyone out there can possibly explain a little futher.