A New Aneurysm Occlusion Classification after the Impact of Flow Modification

Area of Science:

• Neurology
• Interventional Radiology
• Medical Imaging

Background:

• Cerebral aneurysms require precise classification for treatment assessment.
• Existing classifications may not fully capture outcomes of diverse endovascular techniques.

Purpose of the Study:

• To propose an expanded classification system for cerebral aneurysms treated with endovascular methods.
• To incorporate novel subgroups reflecting specific treatment outcomes and long-term changes.

Main Methods:

• The study expands the Raymond-Roy Occlusion Classification for endovascularly treated cerebral aneurysms.
• New subgroups are defined for complete occlusion with branch involvement, neck filling, incomplete occlusion, immediate post-treatment status, and stable remodeling.

Main Results:

• Class 1: Complete occlusion, with subdivisions for branch integration/origin.
• Class 2: Neck filling.
• Class 3: Incomplete occlusion.
• Class 4: Immediate postoperative status after flow modification.
• Class 5: Stable remodeling, defined by unchanged or reduced neck filling over time.

Conclusions:

• The proposed classification offers a more comprehensive system for evaluating endovascular treatment of cerebral aneurysms.
• It accommodates various endovascular techniques and introduces the concept of stable remodeling for long-term assessment.