title: Endovascular treatment of unruptured aneurysms.
abstract: OBJECTIVE
  We sought to better define the morbidity of endovascular Guglielmi detachable coil (GDC) treatment of unruptured cerebral aneurysms and to discuss its role in the prevention of subarachnoid hemorrhage.
  
  
  METHODS
  We conducted an observational study from August 1992 to June 1999 of 125 unruptured aneurysms treated with GDC in 116 patients: 91 women (78.4%) and 25 men (21.6%), aged 30 to 78 years (mean age, 50.6 years). Immediate and late clinical results were recorded for any neurological event or hemorrhage related to the treated unruptured aneurysm. Angiographic results are reported as immediate, early (2 to 12 months), intermediate (12 to 30 months), and late follow-up (>30 months).
  
  
  RESULTS
  Immediate angiographic results showed complete obliteration (class 1) in 59 (47.2%) or residual neck (class 2) in 53 aneurysms (42.4%), leaving 6 residual aneurysms (4.8%) and 7 failures (5.6%). Early follow-up angiograms, available in 100 treated aneurysms (84%), revealed class 1 in 52% and class 2 in 41%. Intermediate angiograms, available in 53 aneurysms (44.5%), showed class 1 in 47.2% and class 2 in 43.4%, while late results, available in 37 lesions (31.1%), had class 1 and 2 in 48.6% and 37.8%, respectively. Six patients suffered a permanent neurological deficit at last follow-up (5.2%), with a good outcome in 5 patients and fair outcome in 1 patient. There was no mortality. There was no aneurysmal rupture during a mean clinical follow-up of 32.1 months.
  
  
  CONCLUSIONS
  Endovascular treatment with GDC for unruptured aneurysms is relatively safe. Its role in the prevention of aneurysmal rupture remains to be determined, preferably by a randomized study.
authors.affiliation: Department of Radiology, University of Montreal, Québec, Canada. daniel.roy.chum@ssss.gouv.qc.ca
authors.forename: D
authors.initials: D
authors.lastname: Roy
authors.forename: G
authors.initials: G
authors.lastname: Milot
authors.forename: J
authors.initials: J
authors.lastname: Raymond
mesh_terms: D000328:Adult; D000368:Aged; D017542:Aneurysm, Ruptured / Q000209:etiology; D001807:Blood Vessel Prosthesis / Q000009:adverse effects* / Q000706:statistics & numerical data; D019917:Blood Vessel Prosthesis Implantation / Q000009:adverse effects* / Q000706:statistics & numerical data; D002533:Cerebral Angiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002532:Intracranial Aneurysm / Q000145:classification / Q000000981:diagnostic imaging / Q000601:surgery*; D007431:Intraoperative Complications / Q000209:etiology; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D011183:Postoperative Complications / Q000209:etiology; D011446:Prospective Studies; D012008:Recurrence; D018570:Risk Assessment; D013345:Subarachnoid Hemorrhage / Q000517:prevention & control*; D015996:Survival Rate; D013923:Thromboembolism / Q000209:etiology; D016896:Treatment Outcome