@ScottTriGuy I've read a fair bit about Dr Zamboni and the controversy involved.
On the subject of MS, I saw mention of a presentation to a CCSVI International Society of Neurovascular Diseases Annual Scientific Meeting by a Dr Sal Sclafani, a Vascular surgeon with particualr interest in Nutcracker Syndrome (left renal vein compression between the aorta and superior mesentery artery). It was his experience of treating 100 patients with MS that 60% of them have a greater than 50% stenosis of the renal vein.
This degree of narrowing of the left renal vein would be treated as a "normal variant" of diameter by the vast majority of other Vascular Surgeons but it's interesting to note that the same degree of narrowing is a major problem for a lot of women with Pelvic Congestion Syndrome after the left ovarian vein (LOV) has been embolized because of PCS.
Many doctors are not realising they are causing significantly increased venous pressures in cutting off the return route of blood from the left kidney by embolizing the LOV, and that's a significant volume of blood flow involved. I know from having Nutcracker Syndrome (NCS) myself that about 20% of those with NCS also have POTS (and about 80% with NCS have PCS) and many find the POTS symptoms to resolve in fixing the renal vein blood flow issue.
Dr Sclafani discussed the effectiveness of stenting the left renal vein to improve spinal cord blood flow. He defines CCSVI as a clinical syndrome caused by inhibition of cerebrospinal venous hemodynamics (the theory is that veins bringing blood from the brain and spine back to the heart become too narrow, causing some of that blood to leak into the brain tissue). Sclafani stated that there are several causes of spinal venous congestion and numerous radial veins, which are valveless, until the vertebral veins.
Sclafani believes that many neurological symptoms are associated with Nutcracker Syndrome (which can increase venous pressures in the spinal tract as well as the abdomen and pelvis) and there is this strong association with Multiple Sclerosis.