There's no such thing as basilar "artery" migraines.
The term basilar migraine
dates back to a time when migraine pathophysiology was thought to involve arterial wall constriction followed by compensatory dilation. Basilar migraine was thought due to basilar artery spasm. This notion has been discredited; however, the term is firmly entrenched & we all use it & know what it means & doesn't mean.