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Table 1 Proposed classification of reversible cerebral vasoconstriction syndrome as idiopathic or symptomatic

From: Thunderclap headache attributed to reversible cerebral vasoconstriction: view and review

I

Idiopathic

II

Symptomatic

IIa

Associated with intracranial abnormalities other than cerebral vasoconstriction (i.e., aneurysm, vascular malformation, brain tumor, hemorrhage, venous thrombosis, etc.)

IIb

Associated with systemic diseases

IIc

Associated with use of vasoactive drugs

IId

Associated with pregnancy