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Related Experiment Video

Updated: May 16, 2026

Using a Cell-Tracer Injection to Investigate the Origin of Neointima-Forming Cells in a Rat Saccular Side Wall Model

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Aneurysm embolization grade: a predictive tool for aneurysm recurrence after coil embolization.

Amit Singla¹, Mark R Villwock, Walter Jacobsen

¹Department of Neurosurgery, SUNY Upstate Medical University, Syracuse, NY, USA.

Acta Neurochirurgica

|November 16, 2012

Summary

The Aneurysm Embolization Grade (AEG) system effectively predicts intracranial aneurysm occlusion durability after coil embolization. This validated tool helps assess recurrence risk and guides retreatment decisions for better patient management.

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Area of Science:

Neurosurgery
Interventional Radiology
Medical Imaging

Background:

Coil embolization is crucial for intracranial aneurysms, but recurrence risk necessitates reliable follow-up.
Current methods lack a system to predict aneurysm sac thrombosis accurately.
The Aneurysm Embolization Grade (AEG) was proposed to predict occlusion durability based on hemodynamics.

Purpose of the Study:

To validate the internal reliability of the Aneurysm Embolization Grade (AEG) system.
To assess AEG's predictive value for aneurysm sac thrombosis and long-term occlusion.
To compare AEG with the Raymond-Roy Occlusion Classification (RROC) for predicting outcomes.

Main Methods:

Prospective assignment of AEG and RROC scores to 110 aneurysms treated with coil embolization (June 2008-June 2011).
Analysis of cerebral angiograms to collect AEG and RROC scores for validity assessment.
Evaluation of factors like stent placement and packing density on AEG and RROC.

Main Results:

Post-coiling AEG significantly predicted follow-up angiographic filling characteristics.
AEG scores of 'A' (complete obliteration) showed significantly better outcomes than contrast-flow groups.
Only RROC Type 1 predicted follow-up occlusion durability; stent placement and packing density did not affect long-term outcomes.

Conclusions:

The AEG system, based on angiographic filling, demonstrates high predictive value for aneurysm sac thrombosis.
AEG aids neurointerventionalists in discussing recurrence probability and retreatment needs with patients.
AEG provides a reliable method for assessing the durability of aneurysm occlusion post-embolization.