Ivy sign (brain)

Last revised by Dr Eid Kakish on 02 Aug 2021

The ivy sign refers to the MRI appearance of patients with moyamoya disease or moyamoya syndrome. Prominent leptomeningeal collaterals result in vivid contrast enhancement and high signal on FLAIR due to slow flow. The appearance is reminiscent of the brain having been covered with ivy.

Differential diagnosis

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Cases and figures

  • Case 1
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  • Case 2: axial FLAIR
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  • Case 3: T1C+
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  • Case 4
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