There is evidence of increased CSF pressure with subependymal edema, and possibly other primary features of hydrocephalus (tight ependymal margins, expanded lower segment 3rd ventricular walls).   [Yes/No]

There are additional (secondary) imaging features of  elevated CSF pressure with hyperdynamic CSF pulsations, optic hydrops and papilledema.   [Yes/No]

There is evidence of active leptomeningitis with subpial edema.   [Yes/No]

There is evidence of active leptomeningitis or pachymeningitis related to para-cranial infection (coalescent otomastoiditis, central skull base infection, aggressive nasopharyngeal infection or paranasal sinusitis.   [Yes/No]

There is evidence of CSF hyperintensity consistent with subarachnoid or intraventricular acute or subacute blood products.   [Yes/No]

There is cortical/subcortical edema consistent with cortical venous thrombosis.   [Yes/No]

There is parenchymal edema consistent with arterial thrombosis.   [Yes/No]

There is subcortical and central watershed edema consistent with vasospasm and hypoperfusion.   [Yes/No]

NO other significant imaging findings are present.   [Yes/No]