Fig 3.

Angiographic and histologic images of aneurysm treated with PEG-I devices. A, Preembolization DSA, 4.5 × 10.5 mm (dome x length). B, Posttreatment DSA showing complete occlusion with parent artery compromise. C, A 6-month follow-up DSA showing complete occlusion with parent artery compromise. D–F, Methyl methacrylate embedded, hematoxylin- eosin–stained microtome sections of the aneurysm. D, Aneurysm overview showing hydrogel filaments (black arrows), neointima covered neck (red arrow), the parent artery (PA), and the protrusion into the parent artery (P). E, Enlarged upper square in D. Fibrovascular tissue (FVT) between hydrogel filaments (HF) and mild inflammation. Platinum coil winds added to the hydrogel filament to improve radiopacity are visible (brown arrows). Mild inflammation is present at the surface of the hydrogel filaments. F, Enlarged lower square from D. Hydrogel filaments (HF) supporting a thick, endothelialized new vessel wall (NVW) that traverses the neck of the aneurysm (red arrow) and adheres to the parent artery wall (PAW).