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A 38-year-old woman with relapsing-remitting MS for 3 years. A, High IJ stenosis adjacent to the right C1 lateral mass (arrow). B, CV shows the focal stenosis, whereas a delayed image (C) shows associated non-IJ collateral venous vessels. The left IJ seems normal on CV. The right high IJ was graded severe on both MRV and CV; the left IJ was graded by MRV as mild stenosis, due to the slightly flattened appearance, whereas it was called normal on CV (not shown).
