Single centre experience of stent- assisted coiling of wide- necked basilar tip aneurysms

Objective: To report clinical and radiological follow up outcomes of stentassisted coiling of wide-necked basilar tip aneurysms and to evaluate the safety and efficacy of this treatment choice. Methods: A retrospective review was carried out of 19 patients with wide-necked basilar tip aneurysms in our institution between 2010 and 2020. The rates of perioperative complication, morbidity, mortality, imaging follow up and re-treatment were analysed. Results: Our technical complication rate was 11% but did not result in treatment failure. The combined procedure related morbidity and mortality rate of the 19 patients who underwent stent assisted coiling was also 11%. 16 of 19 patients had undergone angiographic follow up with a mean period of 32 months. 81% of patients with angiographic follow up had a satisfactory occlusion (RROI or II) with 11% requiring re-treatment. Those requiring re-treatment were both treated with laser cut stents; this is in contrast with no re-treatments required in the patients treated with braided stents. Conclusion: Our report provides acceptable outcomes in wide-necked basilar termination aneurysms which are very challenging to treat. Aneurysms treated with braided stents had better efficacy outcomes than those with laser cut stents. Advances in knowledge: Given the emergent and increasing utility of alternative endovascular techniques such as intrasaccular devices and flow diverters, real world data are lacking on more conventional approaches such stentassisted coiling, especially so in the posterior circulation. The associated relatively higher aneurysmal haemorrhagic risk in this location warrants further additional safety and efficacy data for this treatment approach, which this paper provides.