title: Bailout stent deployment during coil embolization of intracranial aneurysms.
abstract: OBJECTIVE
  Self-expandable stents are an effective tool for coil embolization of wide-neck intracranial aneurysms. The purpose of this study was to assess the feasibility and results of bailout stent positioning during rescue situations after deployment of > or =1 coil.
  
  
  METHODS
  Among 318 aneurysms treated by coil embolization in 267 patients, 16 patients who were treated by bailout stent deployment were retrospectively reviewed. Bailout procedures were performed to relieve potential parent artery compromise caused by the protruded coil loops or to prevent migration of the unstable coil basket. The size/location of the aneurysm, technical feasibility, successful stabilization rate, and procedure-related complications were evaluated.
  
  
  RESULTS
  The locations of the aneurysms were the internal carotid artery (n = 12) and basilar artery (n = 4). The mean aneurysm size was 8.3 mm (range, 3.5-19.4 mm) with hemorrhagic presentation in 3 patients. Relief/prevention of parent artery compromise was achieved by molding the encroached loops back into the sac (n = 11), scaffolding the aneurysmal neck in cases with an unstable coil basket (n = 4), and sidetacking the migrated loop to the parent vessel wall (n = 1). The procedure was technically successful in 87.5% (n = 14). Satisfactory molding or stabilization of the coil was seen in 75% (n = 12). Unsatisfactory molding of the protruded small coil loop was noted in 2 cases of small aneurysms. Acute in-stent thrombosis was successfully managed by thrombolysis (n = 1).
  
  
  CONCLUSIONS
  Bailout self-expandable stent deployment may be a feasible and effective method for relief/prevention of parent artery compromise or coil migration caused by prolapsed or unstable coil loops during embolization of aneurysms.
authors.affiliation: Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: E
authors.initials: E
authors.lastname: Yoo
authors.forename: D J
authors.initials: DJ
authors.lastname: Kim
authors.forename: D I
authors.initials: DI
authors.lastname: Kim
authors.forename: J-W
authors.initials: JW
authors.lastname: Lee
authors.forename: S H
authors.initials: SH
authors.lastname: Suh
mesh_terms: D000368:Aged; D001807:Blood Vessel Prosthesis; D004621:Embolization, Therapeutic / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D004868:Equipment Failure; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D015607:Stents; D016896:Treatment Outcome