I just found this info below on the atosa.org site so maybe I've answered my own question. I've had the scalene blocks, the physical exam, the MRI/A/V, the pec minor block and also the venogram and dopplar ultrasound. the last 2 for the venous component. And they all showed TOS so I was surprised that the dr doing the study would say that I couldn't possibly have TOS. ...not that I'm not hopeful for it to go away but my many symptoms aren't imagined.


"Your physician may order an EMG and/or MAC test. These are nerve conduction studies commonly performed to help rule out other compression neuropathies of the upper extremity. The reliability of EMG studies is of great debate in diagnosing TOS as often times EMG studies are inconclusive. Currently, the Medial Antebrachial Cutaneous (MAC) nerve conduction test is being studied as an alternative or addition to EMG studies in diagnosising TOS."