Hi Hairdresser,
I think that I read that you are having a MRI soon.

In my experience the regular MRI does not show the information you need to diagnosis tos.
My regular MRI came back completely normal, the 3DMRA I had with Dr Collins at UCLA showed severe bilateral neurovascular compression. It showed dilated blood vessels that should not be dilated and compression from the bones and scalene muscle on the brachial plexus and vena cava (huge vein)

It there a large teaching hospital that has a 3DMRA? If not just keep in mind that the regular MRI will not show what you need for tos.