Dr. Paoli Zamboni is an Italian vascular surgeon with a controversial theory about multiple sclerosis. He believes that blocked veins prevent blood from draining from the head, causing iron to accumulate in the brain. His method of treatment, called the "liberation procedure" -- surgically opening the veins to restore normal blood flow -- has become hugely popular among desperate MS patients. But there is little scientific evidence to suggest that the procedure actually treats MS successfully.
You can read about the story of the liberation procedure in this excellent article in the New York Times Magazine by Paul Tullis.