Abstract W P83: Intra-aneurysmal Flow Disruption with the Web Device: Midterm Anatomical Follow-up in a Series of 51 Patients

Abstract

Purpose: The objective of intra-saccular flow disruption is the modification of aneurysmal flow by placing a device in the aneurysm sac. Preliminary reports have shown the efficacy of this technique, bit its mid-term efficacy has not yet been evaluated. Materials and Methods: Clinical, procedural, and anatomical data were collected in 9 European centers treating intracranial aneurysms with WEB for more than one year. Clinical and procedural data included age, gender, modalities of treatment, treatment complications, and clinical outcome at hospital discharge and 1 year were collected with a follow-up of at least 1 year. Preoperative, postoperative, intermediate (3-6 months), and mid-term (12-18 months) follow-up DSA or MRA were collected and independently and anonymously evaluated by an experienced interventional neuroradiologist. Occlusion at intermediate and midterm follow-up was separately evaluated using a 4-grades scale (A: total occlusion, AB: opacification of the proximal recess; B: neck remnant, C: aneurysm remnant). Occlusion at midterm was also visually compared to intermediate follow-up and classified as improved, stable, or worsened. Results: 49 patients (34F, 15M, aged 35-74 years, mean: 57.2) harboring 51 aneurysms were included. Aneurysm location was middle cerebral artery in 23 cases, basilar tip in 10 cases, anterior communicating artery in 9 cases, internal carotid artery in 7 cases, and other in 2 cases. Anatomical results are presented and analyzed according to clinical, procedural, and anatomical characteristics. Conclusion: This series is presenting the first analysis of mid-term anatomical results after aneurysm treatment with WEB.