http://www.jvascsurg.org/article/S0741- ... 0/fulltext
This study describes initial observations of imaging the cervical venous circulation in patients with MS. There were a substantial number of patients with venous abnormalities; however, there was no comparative normal group. IVUS was critical in differentiating true abnormalities from venous valvular phenomena, which may prove essential in guiding intervention if a causal relationship is proven.