Subacute and chronic infarcts, vasogenic edema, the punctate and confluent changes of deep white matter ischemia, and dilated VR spaces are not bright.
[spinwarp.ucsd.edu]
[…] or; single thunderclap headache with either normal neuroimaging study or watershed infarct/vasogenic edema or; no thunderclap headache but abnormal angiographic findings
[radiopaedia.org]
Thus, a great variety of manifestations have been observed in different cases, including transient hemiplegia, hemianopsia, monoplegia, aphasia, paresthesia, localized convulsive
[annals.org]