Study finds flow diversion devices safe for brain aneurysms over long follow-up

By AI, Created 6:08 AM UTC, May 18, 2026, /AGP/ – A Chinese Neurosurgical Journal study of 209 patients treated in France found flow diversion devices had strong long-term aneurysm closure rates and no adverse events after 18 months. The findings may support simpler device selection and less intensive follow-up for some patients with intracranial aneurysms.

Why it matters: - Flow diversion devices are used to treat intracranial aneurysms, which can rupture and cause a cerebral hemorrhage. - The study suggests long-term safety concerns may be lower than clinicians feared, especially after the first 18 months. - The findings could affect device choice, patient counseling and follow-up schedules.

What happened: - An international research team studied long-term outcomes in patients treated with flow diversion devices at two tertiary care centers in France between 2011 and 2016. - The study followed patients for up to 13 years after their procedures. - The findings were published March 20, 2026, in the Chinese Neurosurgical Journal. - The paper is titled “Long-term clinical follow-up of intracranial aneurysms treated with flow diverter devices: A bicentric retrospective study.”

The details: - The study included 209 patients treated for 216 aneurysms. - Clinicians deployed 258 flow diversion devices across the cases. - Single-device treatment was used in 83.8% of procedures. - Two or more devices were needed in 16.2% of procedures. - Five flow diversion device types were used. - Pipeline Embolization Devices accounted for 38% of all devices used. - Complications during the procedure affected 4.3% of patients. - Complications within 30 days affected 6.2% of patients. - Three patients, or 1.5%, had adverse events between 1 month and 1 year. - Five patients, or 2.5%, had adverse events between 12 and 18 months. - No adverse events were recorded after 18 months. - 96.7% of patients survived through the end of follow-up. - Procedure-related deaths accounted for 1.4% of patients. - Aneurysm sac closure was sufficient in 93.3% of patients over follow-up. - Outcomes did not differ significantly across the different device types. - Patients who needed multiple devices had a higher risk of insufficient aneurysm closure. - The original paper DOI is available online.

Between the lines: - The strongest signal in the study is not device-specific performance but the role of procedural complexity. - Multiple overlapping devices appear to carry more risk than the choice among different flow diversion platforms. - The absence of late complications may reflect a point where the procedure-related risk curve flattens for many patients. - That said, aneurysm occlusion still needs monitoring, so reduced surveillance does not mean no follow-up.

What’s next: - The researchers said intensive surveillance may be reduced after 18 months, while continued monitoring remains necessary to confirm aneurysm closure. - Clinicians may use the data to match device selection more closely to baseline patient characteristics. - The findings may push more treatment plans toward single-device strategies when technically possible.

The bottom line: - In this long-term retrospective study, flow diversion devices showed durable aneurysm closure and very few late complications, supporting their use as a safe option for many patients with intracranial aneurysms.