Microsurgery for aneurysms on the circle of Willis.
D000328:Adult; D002343:Carotid Artery, Internal / Q000601:surgery; D002941:Circle of Willis / Q000601:surgery*; D003399:Craniotomy; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000401:mortality / Q000601:surgery*; D008297:Male; D008866:Microsurgery / Q000401:mortality; D008875:Middle Aged; D011187:Posture