My TOS imaging revealed compression on subclavian vein and EMG test also showed slowed signal as well as cubitel tunnel syndrome. Saw three doctors, Cedars, UCLA and USC. First offered scalenectomy and second offered rib resection and scalenectomy and the third explained the usual procedure for rib resection and scalenectomy but also offered referral to Mass Gen Hospital to see Dr Donahue.

I also had mild C5-6 disc bulge with osteophyte and mild height loss at the time of TOS diagnosis which spine doctors also said that it is non-surgical and not the cause for pain and neurological symptoms . Within one month from scalene block injection on anterior and middle scales on the right, I started having mild lightheadedness, brain fog and tinnitus.

Thru my numerous imaging reports, I learned that what the report says or what the dr sees are very subjective to their experience and training. For example, some would say mild and another severe, not to mention normal vs compression especially when it comes to very specific conditions. I won't bore you with my story but what concerns me is your mention of how dizziness/brain fog lessening with stopping the throwing. Have you tried botox or scalene block injection for the symptoms relief of TOS if you are not hyper mobile (botox is not good for hyper mobile)? Mass Gen Hospital has you do botox instead of scalene block injection because it is more definitive due to the duration of affect to sort of confirm the success outcome of your surgery if deemed necessary I believe. (Unfortunately the wait for MGH is like a year, they do a lot of revision surgeries as well)

One other thing, I have had two scalene block injections (usually local anesthetic and steroid) by two different providers. One was anterior and middle scalenes only and the other was the 2 scalene muscle, subclavius and pect minor all at once. Interestingly, the latter, gave me more relief. Sometimes the TOS surgery involves pect minor release as well...

Hope this helps.