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Qualitative grading of venous stenosis between 0 (none) and 3 (severe). Examples at the high IJ vein level demonstrate either no stenosis (A) or bilateral mild (B), moderate (C), and severe (D) stenosis. In some severe cases, the IJ was not visualized, as on the right in this example. The cases shown are bilateral for the purposes of example, but in general, left-right asymmetry in the degree of stenosis was more common.
