I went to Los Cabos and had CCSVI procedure with the understanding that it was done according to Dr. Zimboni's protocol but  they did not treat azygos vein.  The excuse he gave me was the jugulars were blocked and the azygos vein was blocked only by 50%.  It is my belief Los Cabos does not treat the azygos vein as doctor told another patient he does not treat azygos vein because in case something goes wrong he has no access.