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A, Comparison of the plaque-to-CSF contrast ratio between asymptomatic and symptomatic stenosis groups. Mean CRs for asymptomatic and symptomatic stenosis are 54.09 ± 13.49% and 63.64 ± 10.56%, respectively. B, Comparison of CRs between moderate and severe MCA stenosis. Mean CRs for moderate and severe stenosis are 55.91 ± 12.82% and 66.78 ± 8.70%, respectively.
