Thanks for your comment "the epidural space between the spinal canal and cord which contains the vertebral veins".
In my limited way of thinking I imagine that there are many, many problems that will cause issues. Are the vertebrals contained within the cord/sac or are they external, and for that matter the arteries as well?
Viewing flow problems would have to be Cine and not MRI?
The clarity of cord MRI is a problem with movement and size so any fluid passage inspection would be 'impossible'?
My previous thought about the disc bulges being seen in many PwMS's MRI's made me think again about my MRI's. (Due for my next one 14.7) The cord is far more of a source of problems than I previously thought from my Doppler assessment which has flow issues when vertical on right side but good flow when lying down.
Do disc bulges ever decrease or disappear (mine seem to have remained)?