I was diagnosed with TOS last year. The only positive test I had was the arterial doppler that shows my pulse diminished when my arms are in certain positions. My problems are mainly with the first three fingers (radial nerve). My neurologist said it's not as common, but still possible. I recently was looking into something called Triangular interval syndrome that is more specific to the radial nerve. Not a lot of info on the web, so I was thinking I might be making another Dr. appointment.