MS Caused By "Blood Blockage Theory"?

Here is an excerpt from BBC.com:

Multiple sclerosis 'blood blockage theory' tested

US scientists are testing a radical new theory that multiple sclerosis (MS) is caused by blockages in the veins that drain the brain. The University of Buffalo team were intrigued by the work of Italian researcher Dr Paolo Zamboni who claims 90% of MS is caused by narrowed veins. He says the restricted drainage, visible on scans, injures the brain leading to MS. He has already widened the blockages in a handful of patients. The US team want to replicate his earlier work before treating patients.

Experts welcomed the research saying it was important to confirm the basic science before evaluating any therapy. MS is a long-term inflammatory condition of the central nervous system which affects the transfer of messages from the nervous system to the rest of the body.