Some of you might like to read on the Thoracic Outlet forum here- If your MRI of the C spine shows no real problems that could be causing symptoms.
If your symptoms are mostly upper body ??
Or if you had any repetitive motion injuries or shoulder injuries.

some info links-
TOS info:
http://www.nismat.org/ptcor/thoracic_outlet/
http://tos-syndrome.com/newpage12.htm
http://tos-syndrome.com

Tos forum-
http://neurotalk.psychcentral.com/forumdisplay.php?f=24