I also think the upper IJV is a very bad place to get an inappropriately placed stent, due to misdiagnosis of a physiological stenosis, due to not using IVUS to see if the upper IJV can distend under certain maneuvers such as valsalva.
It was an excellent in-depth answer from Dr. Sclafani, that showed some of the complexity of CCSVI treatment. Use IVUS, check for phasic vs persistent narrowing, treat the lower narrowings, check again at the upper narrowing, check the dural sinuses for jugular/sinus continuity, check for condylar emissary veins to distinguish between hypoplastic and recanalized thrombosis, consider the patient's ability to return for follow-up care, consider possible ramifications of stents in the upper jugular ... you can see the decision tree sprouting through the answer, and different decisions possible at every branch.
But I am posting about his IVUS abstract, that he has just posted to his Facebook account, which shows that in patients with azygous disease, 8 out of 30, which is 27%, have stenosis that is undetectable by flouroscopy. In these patients, their azygous stenosis was only seen on IVUS and would have gone untreated if the IR did not use IVUS.
If we estimate that 40% of patients have azygous stenosis, which is a guesstimate and I hate starting off with fudged numbers like that, but if we estimate this, then 27% of those 40% means that approximately 10 out of every 100 patients will have an azygous stenosis that would go untreated if IVUS were not used.
Check out the abstract: http://www.facebook.com/Sal.Sclafani.MD