title: Transarterial embolization of type II endoleaks after EVAR: the role of ethylene vinyl alcohol copolymer (Onyx).
abstract: OBJECTIVE
  To determine the feasibility and efficacy of transarterial endoleak embolization using the liquid embolic agent ethylene vinyl alcohol copolymer (Onyx).
  
  
  METHODS
  Over a 7-year period eleven patients (6 women, 5 men; mean age 68 years, range 37-83 years) underwent transarterial embolization of a type II endoleak after endovascular aortic aneurysm repair using the liquid embolic agent Onyx. Two patients (18 %) had a simple type II endoleak with only one artery in communication with the aneurysm sac, whereas 9 patients (82 %) had a complex type II endoleak with multiple communicating vessels. We retrospectively analyzed the technical and clinical success of transarterial type II endoleak embolization with Onyx. Complete embolization of the nidus was defined as technical success. Embolization was considered clinically successful when volume of the aneurysm sac was stable or decreased on follow-up CT scans.
  
  
  RESULTS
  Mean follow-up time was 26.0 (range 6-50) months. Clinical success was achieved in 8 of 11 patients (73 %). Transarterial nidus embolization with Onyx was technically successful in 6 of 11 patients (55 %). In three cases the nidus was embolized without direct catheterization from a more distal access through the network of collateral vessels.
  
  
  CONCLUSIONS
  Onyx is a favorable embolic agent for transarterial endoleak embolization. To achieve the best clinical results, complete occlusion of the nidus is mandatory.
authors: Department of Radiology, University Medical Center Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany, rene.mueller-wille@ukr.de.
authors: René
authors: R
authors: Müller-Wille
authors: Walter A
authors: WA
authors: Wohlgemuth
authors: Peter
authors: P
authors: Heiss
authors: Philipp
authors: P
authors: Wiggermann
authors: Oliver
authors: O
authors: Güntner
authors: Andreas G
authors: AG
authors: Schreyer
authors: Patrick
authors: P
authors: Hoffstetter
authors: Christian
authors: C
authors: Stroszczynski
authors: Niels
authors: N
authors: Zorger
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging / Q000628:therapy*; D004621:Embolization, Therapeutic / Q000379:methods*; D057867:Endoleak / Q000000981:diagnostic imaging / Q000628:therapy*; D057510:Endovascular Procedures / Q000379:methods; D005240:Feasibility Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011145:Polyvinyls / Q000627:therapeutic use*; D011183:Postoperative Complications / Q000628:therapy*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome
chemical_list: D011145:Polyvinyls; C020320:ethylene-vinyl alcohol copolymer