EP21 How far can we go? WEB technology for the treatment of sidewall intracranial aneurysms: Initial single center experience

Materials and Methods Patients were carefully selected. IRB approved. Clinical, anatomical, angiographical, and technical considerations were analyzed. Procedure-related complications, procedural time, antiplatelet therapy requirements. Web Occlusion Scale (WOS) was used for the Follow-up. Results From August 2017 and March 2021 a total of 14 wide-necked, sidewall, IA were selected for WEB treatment. Aneurysm mean size 5.3 mm in width and 5.8 in height. Aneurysm Location: ICA 8 cases (five PComA, two Caro-tid-ophthalmic segment, one AChoA segment), Superior Cere-bellar Artery SCA in 5 patients (35%), and one impressive case in posterior circulation associated with a basilar fenestra-tion next to VBJ. Eight cases were unruptured (57%), and six cases with a history of SAH-acute setting. DAPT was used pre-operatively in all elective cases but no patient remained under antiplatelets after the procedure. Technical success of 100%. Mean procedure time: 24 min. None related procedure com-plications were recorded. Immediately angiographic occlusion was evidenced in 9 cases. Radiological Follow up (ranging 1 – 26 months) available in 9/14 showed a WOS adequate occlusion in all cases. The average age of the cohort was 59.5 years. 85.8% (67/78) coils Avenir coils detached reliably. Good Raymond-Roy occlusion was achieved in 91% (10/11) aneurysms in the immediate post procedural run. There was no mortality or neurological deterioration in the series. There was no intraprocedural aneurysmal rupture from Avenir coils. Conclusions The Wallaby Avenir coil system have excellent intraprocedural safety prolife with no procedure related mortality or morbidity and good postprocedural aneurysm occlusion rates.