o2bponca-
sorry to hear that there's so much going on. it is overwhelming! I was referred to a thoracic vascular surgeon by my pain mgmt doc (who is a neurologist also) to get his opinon on surgery. He thought it might help, but was hesitant to recommend surgery for me b/c the problem seems to be neurologic. I saw him about a year later for a follow-up, and we came to the same conclusion (for now) that non-surgical treatment is a better alternative for me. ANyways, to answer your question, a thoracic-vascular surgeon is just a doc that specializes in this region of the body. When the doc i saw would operate on a TOS patient, he would operate in conjunction with a neurosurgeon.

good luck.... there is lots of good information around here, and welcome!