Ivy sign (brain)
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At the time the article was created Frank Gaillard had no recorded disclosures.View Frank Gaillard's current disclosures
The ivy sign refers to the MRI brain appearance of patients with moyamoya disease or moyamoya syndrome. Prominent leptomeningeal collaterals result in high signal on FLAIR due to slow flow and vivid contrast enhancement on post-contrast T1 1-3. The sign may be more reliably seen on post-contrast T1 than FLAIR 3. The appearance is reminiscent of the brain having been covered with ivy.