Migranous vasospasm is a subset of reversible cerebral vasoconstriction syndrome. It is also known as "crash migraine" although it is sometimes described as a separate condition.
Whether migraine is actually a predisposing factor to RCVS or it is simply that migraine is common (up to 12% of the population) and will therefore be reported by patients with RCVS is uncertain. Migraineurs with RCVS do not report typical migranous auras, and is different from thier normal migraines.
- LH Calabrese et al "Narrative Review: Reversible Cerebral Vasoconstriction Syndromes" Ann Intern Med. 2007;146:34-44.