Hi BlueFox,
I'm very interested in the replies you get as I also have a Syrinx but it's at the top of my thoracic spine, I had an MRI of my cervical spine and they could see the top of it at C7-T1 so then had a thoracic MRI.
I've also done a lot of research, different opinions, needs to be watched? who knows, my Dr has not even mentioned it.
Take good care of yourself!
don't give up!