title: The Circle of Willis--the incidence of developmental abnormalities in normal and infarcted brains.
mesh_terms: D002536:Cerebral Arteries / Q000473:pathology; D002561:Cerebrovascular Disorders / Q000473:pathology*; D002941:Circle of Willis / Q000473:pathology*; D005260:Female; D006801:Humans; D007238:Infarction / Q000473:pathology*; D002537:Intracranial Arteriosclerosis / Q000453:epidemiology; D002542:Intracranial Embolism and Thrombosis / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D013223:Statistics as Topic