Let's not forget this finding:
Findings on a Zamboni-protocol US are not associated with findings on contrast venography in light of the high false negative rate; 99% of the patients with a negative US had a significant stenosis and/or flow abnormality treated with angioplasty. A prospective study is needed to define the role of US and other modalities in the non-invasive diagnosis of CCSVI.
J. G. Almond1, M. Englander1, K. Mandato1, S. Parikh1, G. Siskin1
Source: http://www.sirmeeting.org/index.cfm?do= ... s&abs=2088
Also how about the azygos? You can't even see that one with ultrasound.