PT  - JOURNAL ARTICLE
AU  - Maeda, Masayuki
AU  - Tsuchida, Chika
TI  - “Ivy Sign” on Fluid-Attenuated Inversion-Recovery Images in Childhood Moyamoya Disease
DP  - 1999 Nov 01
TA  - American Journal of Neuroradiology
PG  - 1836--1838
VI  - 20
IP  - 10
4099  - http://www.ajnr.org/content/20/10/1836.short
4100  - http://www.ajnr.org/content/20/10/1836.full
SO  - Am. J. Neuroradiol.1999 Nov 01; 20
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.