A new study has cast doubt on the theory that blocked or narrowed veins are a main cause of MS, study author Dr. Robert Zivadinov of the University of Buffalo said.
The findings published Wednesday in the journal Neurology were consistent with thinking that the condition — also known as chronic cerebrospinal venous insufficiency, or CCSVI — is more common in patients with multiple sclerosis but not to the degree first reported by Italian doctor Paolo Zamboni.
"These findings indicate that CCSVI does not have a primary role in causing MS," said Zivadinov, who has worked with Zamboni.
Zamboni proposed that multiple sclerosis may be linked...