Wow, they have some very similiar symptoms. My husband has had nerve conductivity testing, vascular studies, ultra sounds... but it sounds like TOS can be as difficult to diagnos as RSD. My husbands left arm was fully extended and did not give as his mixer truck hit a log truck that pulled out in front of him. His arm took such blunt force trauma, that i am surprised it didn't break/fracture. The medics originally thought he had broken his shoulder or back. We have an appt next week with his pain management doctor and will definitely ask his thoughts on TOS vs RSD or the combo.
Thanks again for your help. It is greatly appreciated!