title: [A rare anomaly of the circle of Willis : infra-optic course of both anterior cerebral arteries: associated aneurysm of the basilar bifurcation (author's transl)].
abstract: A rare anomaly of the A1 portion of both ACA associated with a saccular aneurysm of the basilar bifudcation is presented. Based upon this case and eigth other cases in the literature, the anatomical and radiological features of the anomaly are precised : the anomalous artery comes from the internal carotid artery right over the cavernous sinus, very close to the origin of the ophtalmic artery; it rums medailly below the inferior aspect of the optic nerve, thus being projected under the plane of the optic canal on oblique angiograms; finally, it crosses the anterior edge of the optic chiasm up to the interhemispheric fissure. By itself the anomaly is asymptomatic but it should not be considered as a mere curiosity since it has most often been found associated with a variety of cerebral vasculature anomalies and in particular with encor more saccular aneurysms of the circle of Willis.
mesh_terms: D001921:Brain / Q000098:blood supply; D002343:Carotid Artery, Internal / Q000002:abnormalities; D002536:Cerebral Arteries / Q000002:abnormalities; D002941:Circle of Willis / Q000002:abnormalities*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010641:Phenotype
vernacular_title: Anomalie rare du polygone de Willis : trajet sous-optique des deux artères cérébrales antérieures--anévrysme associé de la bifurcation du tronc basilaire.