Are you still trying to decide if this is TOS or another neuropathy? Any Dr. worth his salt should have a pretty good idea with the pattern or distribution of the paresthesia.
Vascular TOS will almost always include most of the arm and the whole hand. As in the front, back and sides of the hand. Also it tends to be more of a problem at night, a quick test you can do yourself is roos'.
With help you can do Costoclavicular or edens test.
A peripheral nerve TOS can have a different presentation because the nerves that are typically pinched like the Median, Radial and Ulnar nerves have specific patterns of parasthesia,
here is a good picture http://www.orthopaedicsone.com/display/Clerkship/Peripheral+Nerves+of+the+Upper+Extremity
A test is the brachial plexus tension test. http://www.physio-pedia.com/Upper_Limb_Tension_Test
You could have a nerve pinch in your neck typically this will follow dematomes if it is only one level, it gets more complicated with multiple levels, this page has a good picture of the dermatomes.
Tests for these are foraminal compression, maximal foraminal compression and cervical distraction. http://www.physio-pedia.com/Spurling's_Test
Last you can have referred pain from structures in your neck and shoulder.
For TOS it doesn't matter what is causing the compression, a lymph node is a real possibility. Other differential diagnosis although extremely rare is a tumor or anything that can cause pressure.
Have you had an MRI or angio-MRI?
Post Edited (gregkdc) : 11/19/2015 6:41:30 PM (GMT-7)