Figure 3From: Multimodal noninvasive and invasive imaging of extracranial venous abnormalities indicative of CCSVI: Results of the PREMiSe pilot study Catheter venography of azygos and internal jugular veins (IJVs). Example of normal patent lumen of the azygos vein (A) and left internal jugular vein (IJV) (B). Significant stenosis of the distal left IJV (C) with prominent collateral vein (arrow).Back to article page