oh and I learned to request that copies of all tests results be sent to me also.
It's handy to have them in your own records- some will send them with out you asking ,but it's good to ask to be sure you do get them.

Where is your atrophy? hand/arm?

you may have what is termed a double or triple "crush"
If you have TOS and also do have the nerve impinged or entrapped at other locations in the arms ie - ulnar or carpal tunnel or both.
nerve conduction study NCV/EMG would show if they are involved for real

TOS symptoms can appear in those places but the cause is higher up in the neck or arm pit.