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Histology and DSA illustrative correlation of poor wall apposition associated with incomplete aneurysm occlusion. Follow-up DSA objectively shows incomplete occlusion of the aneurysm sac (blue arrow) (A). Photomicrograph at the level of the aneurysm neck (hematoxylin-eosin staining, original magnification × 100) shows poor wall apposition (yellow dotted line) and filling of the aneurysm pouch with a partial thrombosis in the aneurysm sac (B).
