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RT Journal Article
SR Electronic
T1 “Ivy Sign” on Fluid-Attenuated Inversion-Recovery Images in Childhood Moyamoya Disease
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 1836
OP 1838
VO 20
IS 10
A1 Maeda, Masayuki
A1 Tsuchida, Chika
YR 1999
UL http://www.ajnr.org/content/20/10/1836.abstract
AB Summary: We report on MR studies of a 15-year-old girl with moyamoya disease in whom diffuse leptomeningeal enhancement (“ivy sign”) was revealed by fluid-attenuated inversion-recovery (FLAIR) and contrast-enhanced imaging. We speculate that the mechanism behind this enhancement is caused by a retrograde slow flow of engorged pial vasculature via leptomeningeal anastomosis. Nevertheless, it remains unknown whether the precise source of a high signal on FLAIR images is attributable to pial vessels themselves or congested thickening of the leptomeninges or both.