- FLAIR: bright sulci or leptomeningeal "ivy" sign. Given the post-contrast and angiographic findings, this represents slow-flowing engorged pial vessels, thickened arachnoid membranes
- T1WI C+: leptomeningeal enhancement (contrast-enhanced "ivy" sign)
- MRA: narrowed distal internal carotid artery and proximal circle of Willis vessels, which would correspond to a "puff of smoke" appearance on conventional angiography