38 year old female with history of syncope landing on face with nose bleed.
MRI shows subtle FLAIR signal abnormality in the subarachnoid spaces along the interhemispheric fissure, lateral sulcal spaces and sylvian fissures bilaterally.
Ventricles and basal cisterns are otherwise normal. There is normal gray matter white
matter differentiation with no acute cytotoxic or vasogenic edema by
FLAIR or diffusion-weighted images. There is no active diffusion
restriction to suggest acute infarct.
Gadolinium-enhanced images demonstrate extensive superficial linear
and nodular enhancement within the sulcal spaces on both cerebral
hemispheres and cerebellar hemispheres and to a lesser extent