What is the zamboni theory about multiple sclerosis?

Good question: This has to do with the idea that an ms pt might have abnormal venous drainage from the brain resulting in the ms lesions. This has resulted in some surgical corrections being done, with no proof whatsoever, of any effect on the disease, and some deaths secondary to surgical complications. These vein variations are seen in patients with and without ms.

Vascular surgery: Dr. Mechanic's answer is correct. It is important to realize that dr. Zamboni is a vascular surgeon, not a neurologist, and he did this surgery in a non-controlled fashion. More recent studies have shown no benefit to this surgery, and given the real risks of this surgery, it is not recommended.