P091 Efficacy and safety of flow diversion in the treatment of carotico-ophthalmic aneurysms

<h3>Introduction</h3> Carotico-ophthalmic aneurysms represent 5.6% of all intracranial aneurysms¹. Flow diversion has been shown to be effective in the treatment of intracranial aneurysms, demonstrating high rates of occlusion and low complication rates. <h3>Aim of Study</h3> The study aimed to assess the efficacy and safety of flow diversion in the treatment of carotico-ophthalmic aneurysms. <h3>Methods</h3> Patients from two institutions with carotico-ophthalmic aneurysms treated with flow diversion between 2015 and 2021 were retrospectively analysed. Patient demographics, aneurysm characteristics, clinical outcome, and follow-up imaging were assessed. <h3>Results</h3> 106 patients were treated using 10 different types of flow diverter. 97% of patients were female. 28% had hypertension, 27% were active smokers, and 18% were ex-smokers. Three patients were acute presentations. Mean maximum aneurysm width diameter was 7.25mm (1.5 – 25.8) and mean aneurysm neck diameter was 4.36mm (1.2 – 9.46). 30.2% of patients had adjunctive coiling. Complications included intracranial haemorrhage (n = 1), major stroke (n = 2), minor stroke (n = 13) of which all had resolved at 6 months, and groin complications (n = 10). Mortality was &lt;1%. No visual symptoms were reported. 96% of patients received follow-up, with an average follow-up duration of 23.7 months. 94% of patients had complete occlusion (RROC 1) on follow-up imaging, and 100% of patients had adequate occlusion (RROC 1 or 2) on the most recent imaging. <h3>Conclusion</h3> The study demonstrates that flow diversion is both effective and safe in the treatment of carotico-ophthalmic aneurysms, providing extremely high rates of occlusion and low rates of morbidity and mortality. <h3>Disclosure of Interest</h3> no.