As a critical result in different researches the sign of FHV refers to the hemodynamic impairment and slow retrograde flow in leptomeningeal collaterals with or without good clinical outcome. We collected MR imaging data of 32 patients with unilateral ICA stenosis-occlusion who all underwent MR examinations by using 3D tASL perfusion imaging and T2-FLAIR. The tASL perfusion scores were compared between in FVH(-) group (14 patients) and FVH(+) group (18 patients), and there was no difference in the 2 groups. The result showed that 3D tASL perfusion MRI may be a useful non-invasive tool to identify the collateral flow.
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