Venous Multiple Sclerosis Hypothesis | CCSVI

Chronic cerebro-spinal venous insufficiency (CCSVI) is a term used to describe compromised flow of blood in the veins draining the central nervous system. It has been hypothesized to play a role in the cause of multiple sclerosis (MS). This hypothesis was first put forth by Paolo Zamboni in 2008. 

The hypothesis and procedure has generated optimism among people with MS but received skepticism from the majority of the medical community.

A more detailed description can be found on Wikipedia.