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Classification of angiographic results after endovascular treatment with any technique
Classification
Class 1: Complete occlusion of the aneurysm sac. When there is a branch integrated with the aneurysm sac, ie, coming off the aneurysm, at any point of the sac, further analysis is carried out with subgroups
    1A: Complete occlusion with the full patency of the integrated branch
    1B: Complete occlusion with the branch reduced in caliber
    1C: Complete occlusion with no antegrade filling of the branch
Class 2: Neck filling
Class 3: Incomplete occlusion with aneurysm filling
Class 4: Aneurysm filling. This class is reserved for an immediate postoperative result based on end-of-treatment DSA; after extra- and/or intrasaccular flow modification treatment
    4A: With contrast stagnation—contrast stagnation is referred to when there happens to be any change in the duration of the contrast stay within the aneurysm sac after treatment
    4B: Without contrast stagnation
Class 5: Stable remodeling with flow modification. Filling in the neck region, which stays unchanged or reduced; to be included in this group, there have to be at least 2 consecutive control angiographies, by definition, at least 6 months apart, and expanding for a period of not <1 year; exceptionally, 1 control angiography could be sufficient for definition of class 5, only in selected cases of contrast filling the branch coming off the sac, with an appearance of a different vessel course than the original, eg, tortuous or dilated, given that it is in continuation with the parent artery with no sac filling