A technical consideration when using flow diversion for recurrent aneurysms following stent-assisted coiling.

Area of Science:

• Interventional Neuroradiology
• Cerebrovascular Surgery

Background:

• Flow diversion (FD) is an emerging, off-label treatment for recurrent aneurysms, particularly after stent-assisted coiling (SAC).
• A significant technical hurdle in FD placement post-SAC involves preventing microwire deviation from the stent's central axis, which can lead to incomplete device opening or thromboembolic events.

Observation:

• This report details a modified technique for FD deployment in patients with prior SAC.
• The key modification involves advancing an intermediate catheter completely through the prior stent before FD deployment.

Findings:

• The intermediate catheter's larger diameter successfully guided the microwire within the central axis of the previously placed stent.
• This maneuver prevented the "in-out-in" deviation of the microwire, ensuring accurate FD positioning.

Implications:

• This technique offers a reliable method to overcome a critical challenge in FD placement following SAC.
• It may improve the safety and efficacy of flow diversion for complex aneurysm treatment, potentially reducing thromboembolic complications.