title: [Different methods of intracranial-extracranial bypass surgery for the treatment of intracranial aneurysms].
abstract: OBJECTIVE
  To investigate the effects and methods of intracranial-extracranial (IC-EC) bypass surgery in the treatment of intracranial aneurysms.
  
  
  METHODS
  The clinical material of 9 cases, who performed IC-EC bypass surgery before occlusion of the parental arteries of intracranial aneurysms, was studied retrospectively, especially how to evaluate the co-lateral circulation of the parental arteries and how to select the different methods of IC-EC bypass surgery.
  
  
  RESULTS
  The co-lateral circulation in 9 cases was not enough to meet the need of the cerebral blood flow after occlusion of the parental arteries of the aneurysms. Revascularization by different methods of IC-EC bypass surgery and then occlusion of the parental arteries, ischemia in the brain area feeding by occluded parental arteries of the aneurysms did not occurred.
  
  
  CONCLUSIONS
  When the co-lateral circulation of the parental arteries of intracranial aneurysm is not enough, the revascularization by different methods of IC-EC bypass surgery is needed before occlusion of these arteries.
authors.affiliation: Department of Neurosurgery, Xuanwu Hospital, Capital University of Medical Sciences, Beijing 100053, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Li
authors.forename: Hong-qi
authors.initials: HQ
authors.lastname: Zhang
authors.forename: Feng-zeng
authors.initials: FZ
authors.lastname: Jian
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Xing-long
authors.initials: XL
authors.lastname: Zhi
authors.forename: Feng
authors.initials: F
authors.lastname: Ling
mesh_terms: D000293:Adolescent; D000328:Adult; D002548:Cerebral Revascularization / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002532:Intracranial Aneurysm / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies