http://en.wikipedia.org/wiki/Chronic_cerebrospinal_venous_insufficiency

Chronic cerebrospinal venous insufficiency (CCSVI or CCVI) is a term developed by Italian researcher Paolo Zamboni in 2008 to describe compromised flow of blood in the veins draining the central nervous system.^[1][2] Zamboni hypothesized that it played a role in the cause of multiple sclerosis (MS).^[3][4] Zamboni also devised a procedure (Zamboni liberation procedure or Zamboni liberation therapy) involving angioplasty (or stenting) of certain veins in an attempt to improve blood flow.^[5][6]

Within the medical community, both the procedure and CCSVI itself have been met with skepticism. The United States Food and Drug Administration states that it is not clear if CCSVI exists and that these treatments may cause more harm.^[7] Zamboni's first published research was neither blinded nor did it have a comparison group.^[5] Research on CCSVI has been fast tracked but researchers have been unable to confirm whether CCSVI has a role in causing MS.^{[8][9][10][11][12]} The "liberation procedure" has been criticized for possibly resulting in serious complications and deaths while its benefits have not been proven.^[5][6] This has raised serious objections to the hypothesis of CCSVI originating multiple sclerosis.^[13] Additional research efforts investigating the CCSVI hypothesis are underway.

More at http://en.wikipedia.org/wiki/Chronic_cerebrospinal_venous_insufficiency