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A 47-year-old woman with frequent transient left upper and lower motor weakness. Arrows indicate the ivy sign. The ivy sign score of the right side is 1 in the ACA and PCA regions, respectively, and 2 in the ant-MCA and post-MCA regions, respectively. No ivy sign is seen on the left side. The ivy sign score in individual hemispheres is 6 on the right side and zero on the left side.
