Endovascular Coiling of Wide-Neck and Wide-Neck Bifurcation Aneurysms: A Systematic Review and Meta-Analysis

BACKGROUND AND PURPOSE: We present the results of a systematic review and meta-analysis examining outcomes of endovascular coiling of wide-neck and wide-neck bifurcation aneurysms with and without stent assistance. The aim of our study was to assess angiographic and clinical outcomes. MATERIALS AND METHODS: We performed a comprehensive literature search for all articles on the endovascular coiling of wide-neck and wide-neck bifurcation aneurysms. Studies meeting our inclusion criteria and abstracted data were selected by 2 independent reviewers. Primary outcomes were > 6-month complete or near-complete angiographic occlusion, aneurysm recanalization, and aneurysm retreatment. Secondary outcomes included initial complete or near-complete occlusion, long-term good neurologic outcome, procedure -related morbidity, and procedure-related mortality. Data were analyzed by using random-effects meta-analysis. RESULTS: In total, 38 studies including 2446 patients with 2556 aneurysms were included. For all wide-neck aneurysms, immediate complete or near-complete occlusion rate was 57.4% (95% Cl, 48.1%-66.8%). Follow-up near-complete occlusion rate was 74.5% (95% Cl, 68.0%-81.0%). Recanalization and retreatment rates were 9.4% (95% Cl, 7.1%-11.7%) and 5.8% (95% Cl, 4.1%-7.5%), respectively. Long-term good neurologic outcome was 91.4% (95% Cl, 88.5%-94.2%). For wide-neck bifurcation aneurysms, initial complete or near-complete occlusion rate was 60.0% (95% Cl, 42.7%-77.3%), long-term complete or near-complete occlusion rate was 71.9% (95% Cl, 52.6%-91.1%), and the recanalization and retreatment rates were 9.8% (95% Cl, 7.1%-12.5%) and 5.2% (95% Cl, 1.9%-8.4%), respectively. CONCLUSIONS: Our study of angiographic and clinical outcomes for patients with wide-neck aneurysms demonstrates that endovascular coiling with or without stent-assisted coiling is safe, with low rates of perioperative morbidity and mortality. Initial and long-term angiographic outcomes were generally satisfactory, but not ideal. These data provide some baseline comparisons against which emergent technologies can be assessed.