• OliveiraLeonardo de BarrosLBDepartment of Neurosurgery, State University of Ponta Grossa, Paraná, Brazil. Electronic address: leobarrosoliveira09@gmail.com., Marcelo Porto Sousa, RibasLuiz Roberto CavassolaLRCDepartment of Neurosurgery, State University of Ponta Grossa, Paraná, Brazil., Lucca B Palavani, Sávio Batista, Nicollas Nunes Rabelo, Raphael Bertani, Leonardo Christiaan Welling, and Eberval Gadelha Figueiredo.
• Department of Neurosurgery, State University of Ponta Grossa, Paraná, Brazil. Electronic address: leobarrosoliveira09@gmail.com.
• World Neurosurg. 2024 Mar 1; 183: 152815-28.

ObjectiveTreating complex posterior circulation aneurysms poses challenges, and extracranial to intracranial (EC-IC) bypass techniques are potential therapeutic options. However, the safety and efficacy of this approach for posterior circulation aneurysms remain unclear. The study's objective was to assess the safety and efficacy of EC-IC bypass in these aneurysms.MethodsAdhering to Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines, we conducted a systematic review on EC-IC revascularization for posterior circulation aneurysms. Included studies had at least 4 patients and reported data on mortality, patency, complications, or clinical outcomes. Favorable clinical outcomes were defined as modified Rankin Scale below 3 or Glasgow Outcome Scale above 3, and complications were any issues related to the bypass procedure.ResultsFrom 3036 articles reviewed, 22 studies involving 196 patients who underwent 210 EC-IC bypass procedures for posterior circulation aneurysms were selected. The median follow-up period of 14 studies was 31.66 months (6-61 months). Final follow-up indicated a high bypass patency rate of 96% [95% confidence interval [CI]: 91%-100%; I2 = 12%], with a mortality rate of 5% [95% CI: 1%-9%; I2 = 0%]. Additionally, 83% [95% CI: 70%-96%; I2 = 77%] of patients showed good outcomes at the last follow-up. Complications were observed in 40% [95% CI: 26%-55%; I2 = 80%]. Heterogeneity was associated with specific studies.ConclusionsEC-IC bypass procedures are a viable treatment option for posterior circulation aneurysms, with high bypass patency rates and favorable clinical outcomes. However, complications, especially neurological deficits, exist. Open revascularization remains essential for neurovascular surgeons dealing with complex aneurysms.Copyright © 2023 Elsevier Inc. All rights reserved.

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