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. 2021 Jul 15;31(12):9252–9261. doi: 10.1007/s00330-021-08170-8

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© The Author(s) 2021

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Fig. 1 — a ROI setting on Silent MRA. b ROIs were set on the cavernous ICA ipsilateral to the nidus (red circle) and (c-d) the proximal segment of drainage veins (green and blue circle) on axial source images. The ratio of signal intensity of each draining vein was calculated.