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Ivy sign (brain)

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

Inspired signs
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Article information

rID: 10726
Section: Signs
Synonyms or Alternate Spellings:
  • Ivy sign of moyamoya syndrome
  • Ivy sign of moyamoya disease

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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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