The association between migraine attacks and permanent neurological deficits has been recognized since the original description of persistent visual deficits by Féré in 1861 1 and Galezowski in 1881. 2 Féré described 10 cases, of which four were left with permanent deficits that included hemianopia (3) and aphasia (1). The term 'complicated migraine'was coined by Charcot in 1890. 3 Subsequently in 1915, Hunt 4 expanded the range of neurological deficits associated with a migraine attack to include permanent paralysis.More recently a wide range of descriptive terminology has emerged to define the complex relationship between migraine and stroke. This includes: 'active migraine and stroke ', 5 'migrainous infarction', 6 'migraine-induced stroke' a n d ABSTRACT: A significant association between migraine and ischemic stroke has been demonstrated in population and case-control studies. The risk of ischemic stroke appears to be higher in migraine with aura (MWA) than migraine without aura (MwoA). Migraine-stroke comprises a number of distinct entities, including migrainous infarction, in which ischemic stroke occurs during an attack of MWA and migraine-related stroke, in which the causal link is less clear. Migrainous infarction accounts for only one-third of migraine-stroke, strokes may occur during attacks of MwoA, and a number of cerebrovascular disorders may present as MWA or MwoA. Migraine may occur as a consequence of conditions that are known to cause stroke; therefore it remains to be determined whether migraine predisposes to stroke in the absence of any known disease associations, if it is an epiphenomenon of an underlying stroke diathesis, or if it requires the presence of another stroke risk factor to produce cerebral ischemia. Furthermore, it is unclear if ischemia results in migraine more often than migraine results in ischemia. Careful clinical studies that evaluate this bidirectional relationship are needed to determine why migraine patients are subject to a higher risk of ischemic stroke.RÉSUMÉ: Migraine -accident vasculaire cérébral: une relation causale, mais dans quelle direction? Des études de population et des études cas-témoin ont montré une association significative entre la migraine et l'accident vasculaire cérébral ischémique (AVCI). Le risque de faire un AVCI semble plus élevé dans la migraine avec aura (MAA) que dans la migraine sans aura (MSA). La migraine -AVC comprend plusieurs entités distinctes dont l'infarctus migraineux dans lequel l'AVCI survient pendant une crise de MAAet la migraine reliée à l'AVC dont le lien causal est moins clair. L'infarctus migraineux explique seulement le tiers des cas de migraine -AVC. Un AVC peut survenir pendant une crise de MAA et certains troubles vasculaires cérébraux peuvent avoir un mode de présentation semblable à celui de la MAA ou de la MSA. La migraine peut survenir comme conséquence de pathologies reconnues comme causant l'AVC. Il reste donc à déterminer si la migraine prédispose à l'AVC en l'absence d'une association connue avec une autre ma...