[Variation of the circle of Willis related to the pathogenesis of cerebral aneurysm (author's transl)].
D000328:Adult; D000368:Aged; D002941:Circle of Willis / Q000002:abnormalities / Q000473:pathology*; D006801:Humans; D002532:Intracranial Aneurysm / Q000209:etiology / Q000473:pathology*; D008875:Middle Aged