title: Long-term clinical and radiologic results of small cerebral aneurysms embolized with 1 or 2 detachable coils.
abstract: BACKGROUND
  Small cerebral aneurysms embolized with only 1 or 2 detachable coils often seem unstable and unsatisfactory. We tried to assess the long-term results of such embolized aneurysms.
  
  
  METHODS
  Among 231 intracranial saccular aneurysms embolized at the Asan Medical Center between July 1995 and July 2004, 27 small aneurysms were occluded with only 1 (n = 12) or 2 (n = 15) detachable coils. Clinical and radiologic results were evaluated retrospectively for the involved patients.
  
  
  RESULTS
  For the 1- and 2-coiled aneurysms, respectively, the mean dome sizes were 3.0 and 4.6 mm and the mean neck sizes were 1.9 and 2.7 mm. Most of the aneurysms were in the posterior circulation (19/27, 70%) and were found after bleeding (17/27, 63%). At the end of the embolization, complete occlusion in 19 aneurysms, residual neck in 1 aneurysm, and residual aneurysm in 7 aneurysms were attained angiographically. The mean packing ratios were 17.9% and 20.7% for the 1- and 2-coiled aneurysms, respectively. The mean clinical follow-up period of the patients was 41 months. No patient showed evidence of rebleeding; in addition, 1 patient with 1 coil and 2 patients with 2 coils were not followed up after discharge. Among the 10 follow-up DSAs or MRAs acquired after more than 8 months, radiologic major recurrences were detected in 2 patients after 10 and 15 months and second embolizations were done.
  
  
  CONCLUSIONS
  Although the 1- and 2-coiled small aneurysms with a relatively low packing ratio seemed unstable, they showed a relatively low incidence of rebleeding and recurrence.
authors.affiliation: Department of Neurological Surgery, University of Ulsan, Seoul Asan Medical Center, Seoul 138-736, South Korea.
authors.forename: Hyon-Jo
authors.initials: HJ
authors.lastname: Kwon
authors.forename: Jun-Bum
authors.initials: JB
authors.lastname: Park
authors.forename: Yang
authors.initials: Y
authors.lastname: Kwon
authors.forename: Jae-Sung
authors.initials: JS
authors.lastname: Ahn
authors.forename: Byung-Duk
authors.initials: BD
authors.lastname: Kwun
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001488:Basilar Artery / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D004621:Embolization, Therapeutic / Q000295:instrumentation* / Q000379:methods* / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000473:pathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D019736:Prostheses and Implants / Q000592:standards* / Q000706:statistics & numerical data / Q000639:trends; D012189:Retrospective Studies; D055502:Secondary Prevention; D013995:Time; D016896:Treatment Outcome