Complications and adverse events associated with Neuroform stent-assisted coiling of wide-neck intracranial aneurysms

Neurol Res. 2011 Oct;33(8):841-52. doi: 10.1179/1743132811Y.0000000012.


Background: Successful experiences of the Neuroform stent-assisted coiling have been reported by many teams in endovascular neurosurgery centers throughout the world. However, most of the reported complications involved a limited number of patients.

Objective: To systematically report the complications of Neuroform stent-assisted coiling of intracranial aneurysms and to tentatively assess the efficacy and safety of this method.

Methods: A retrospective study of 232 consecutive patients with 239 wide-neck aneurysms treated with Neuroform stent-assisted coil embolization at our institution over a 6-year period was performed. Angiographic results and clinical outcome were evaluated. Cases with complications were analyzed.

Results: Stenting was successful in 237 of 239 aneurysms. Favorable clinical outcome (modified Rankin score: 0-2) was observed in 88·3% of the patients. Procedure-related complications included thromboembolism (n = 13), intraprocedural rupture (n=8), coil protrusions (n=5), new mass effect (n=3), vessel injury (n=3), and stent dislodgement (n=2). Procedure-related morbidity and mortality were 4·2 and 1·3%, respectively. Non-procedural complications attributable to subarachnoid hemorrhage in 129 patients with ruptured aneurysms were symptomatic vasospasm (18·6%) and shunt-dependent hydrocephalus (6·9%). Angiography follow-up was obtained in 67·1% of the treated aneurysms. The overall recanalization rate was 14·5%. Delayed complications included in-stent stenosis (n=2) and penetrating artery occlusion (n=2) in follow-up period.

Conclusion: Neuroform sent-assisted coiling of intracranial aneurysm is a safe technique with relatively low recanalization rate. The main cause of morbidity and mortality is thromboembolism. Long-term effect on parent artery should be observed carefully.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Blood Vessel Prosthesis / adverse effects*
  • Blood Vessel Prosthesis Implantation / adverse effects*
  • Blood Vessel Prosthesis Implantation / methods
  • Blood Vessel Prosthesis Implantation / mortality
  • Cerebral Angiography / methods
  • Female
  • Humans
  • Intracranial Aneurysm / diagnostic imaging
  • Intracranial Aneurysm / surgery*
  • Male
  • Middle Aged
  • Neurosurgical Procedures / methods*
  • Neurosurgical Procedures / mortality
  • Retrospective Studies
  • Stents / adverse effects*