title: Stent management of coil herniation in embolization of internal carotid aneurysms.
abstract: OBJECTIVE
  Coil herniation into the parent artery after detachment is an uncommon complication of embolization of the intracranial aneurysm. We report our experience with stent reconstruction of the lumen and flow of the internal carotid artery (ICA) after coil herniation during embolization for intracranial ICA aneurysms and the possible mechanisms of coil herniation.
  
  
  METHODS
  A series of 216 consecutive patients was treated by endovascular coil embolizations for intracranial aneurysms. Of these patients, there were 9 (4 men, 5 women; 32-68 years of age) complicating with coil herniation into the ICA and undergoing stent deployment to reconstruct the ICA lumen (n = 8) or both lumen and flow (n = 1). Wide-neck aneurysms were found in 8 and narrow-neck, in 1. Aneurysms were in the posterior communicating artery (n = 5) and the paraophthalmic (n = 3) and cavernous portions (n = 1) of the ICA. Self-expandable stents were deployed in the ICA in 6; balloon-mounted stents were selected in 3.
  
  
  RESULTS
  The causes of coil herniation appeared to be coil instability after detachment (n = 6), excessive embolization (n = 1), microcatheter-related problems (n = 1), or being pushed by subsequent coil embolization (n = 1). Endovascular stent placement to reconstruct the lumen and/or flow of the ICA was technically successful in all 9 patients; 1 needed a second stent due to further coil migration. No significant procedure-related complications were found. Clinical follow-up was 8-35 months.
  
  
  CONCLUSIONS
  Coil herniation occasionally occurs during endovascular embolization of ICA aneurysms because of coil instability after detachment, excessive embolization, microcatheter-related problems, or pushing by subsequent coil embolization. In this small series, stent placement was safe and effective in the reconstruction of the arterial lumen and/or restoration of flow past a herniated coil mass.
authors: Department of Radiology, Taipei Veterans General Hospital and National Yang Ming University School of Medicine, Taipei, Taiwan, Republic of China. cbluo@vghtpe.gov.tw
authors: C-B
authors: CB
authors: Luo
authors: F-C
authors: FC
authors: Chang
authors: M M-H
authors: MM
authors: Teng
authors: W-Y
authors: WY
authors: Guo
authors: C-Y
authors: CY
authors: Chang
mesh_terms: D000328:Adult; D000368:Aged; D001807:Blood Vessel Prosthesis; D002340:Carotid Artery Diseases / Q000150:complications / Q000628:therapy*; D004621:Embolization, Therapeutic / Q000009:adverse effects*; D004677:Encephalocele / Q000209:etiology* / Q000517:prevention & control*; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000209:etiology* / Q000517:prevention & control*; D008297:Male; D008875:Middle Aged; D015607:Stents; D016896:Treatment Outcome