This provides some support for the use of MR imaging to study hemodynamics of the azygous. It also says that in patients with portal hypertension, when the portal hypertension is treated through an angioplasty procedure called TIPS, the blood flow in the azygous decreases by 46%!
For those of us with CCSVI, anytime flow is added to the cerebrospinal drainage in a person with compromised cerebrospinal drainage is not a good thing.
Portal hypertension would be caused by liver disease.
http://emedicine.medscape.com/article/182098-clinicalDetermining the cause of portal hypertension involves the following: History of jaundice, History of blood transfusions, intravenous drug use (hepatitis B and C), Pruritus, Family history of hereditary liver disease (hemochromatosis, Wilson disease), History of alcohol abuse
Here are some doppler images of enlargened azygous veins due to portal hypertension. It states that the doppler is done from the esophagus. We have frequently said that the azygous cannot be directly dopplered but perhaps it can? Would the doppler have to be literally within the esophagus?
http://www.eusatlas.ro/page-119~Portal+ ... +flow.html