title: Single-Stage Coil Embolization of Multiple Intracranial Aneurysms: Technical Feasibility and Clinical Outcomes.
abstract: OBJECTIVE
  Not infrequently, intracranial aneurysms may be multifocal. However, strategies conferring open surgical access to opposite sides of the brain are limited. Given the recent advances in protection devices and coiling technique, a study of single-stage coil embolization in patients with multiple intracranial aneurysms was undertaken, assessing procedural safety and efficacy.
  
  
  METHODS
  Data prospectively accrued between January 2010 and September 2013 were systematically reviewed, assessing clinical and morphologic outcomes of single-stage coil embolization in 172 patients with multiple aneurysms (≥ 2 aneurysms each; total, 371 aneurysms).
  
  
  RESULTS
  Internal carotid artery (n = 132) was the most common site, with progressively fewer aneurysms found elsewhere (middle cerebral artery, 103; anterior communicating artery, 41; posterior communicating artery, 38). In 26 patients, one-stage embolization of three or more aneurysms took place (25 patients with three each; 1 patient with four). Stents were applied in 109 aneurysms, and in 33 lesions, balloons were used. Occlusion was achieved in 326 aneurysms (87.9 %) through coil embolization, and attempted coiling rarely failed (3 of 371, 0.8 %). Mean procedural time was 111.5 ± 37.8 min. Although procedure-related adverse events included three instances of treatment failure, asymptomatic thrombi in four patients, and aneurysmal leakage in one patient, procedural morbidity was low (1 of 172, 0.6 %), and no procedure-related deaths occurred. Postembolization follow-up of 303 aneurysms at > 6 months (mean, 15.4 ± 9.8 months) showed complete occlusion in the vast majority (275 of 303, 90.8 %), with comparatively fewer instances of minor (19 of 303, 6.3 %) and major (9 of 303, 3.0 %) recanalization. Four patients experienced delayed cerebral infarction, but only one suffered permanent neurologic deficit (Glasgow outcome scale 4).
  
  
  CONCLUSIONS
  Single-stage coil embolization of multiple unruptured intracranial aneurysms is technically feasible. The time required for such procedures and the rate of complications observed seem acceptable.
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Y D
authors.initials: YD
authors.lastname: Cho
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Ahn
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: S C
authors.initials: SC
authors.lastname: Jung
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, 110-744, Seoul, Korea.
authors.forename: W S
authors.initials: WS
authors.lastname: Cho
authors.affiliation: Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, 110-744, Seoul, Korea. hsk4428@yahoo.com.
authors.forename: H-S
authors.initials: HS
authors.lastname: Kang
authors.affiliation: Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, 110-744, Seoul, Korea.
authors.forename: J E
authors.initials: JE
authors.lastname: Kim
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.|Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, 110-744, Seoul, Korea.
authors.forename: M H
authors.initials: MH
authors.lastname: Han
mesh_terms: D000328:Adult; D004621:Embolization, Therapeutic / Q000295:instrumentation / Q000379:methods* / Q000401:mortality*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000473:pathology / Q000628:therapy*; D008297:Male; D061646:Operative Time; D011183:Postoperative Complications / Q000175:diagnosis / Q000401:mortality* / Q000517:prevention & control*; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D016896:Treatment Outcome
keywords: Aneurysm; Coil; Embolization; Endovascular