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Neointimal closure of aneurysm necks. Photographs of specimens 3 months after coiling (A), single stent–assisted coiling (B), Y-stent-assisted coiling (C), and Y-stent placement only (D), showing how neointima formed mainly on coil loops. Bare stent struts are shown by arrows in B and C. Note widely open pores in transition zone2 after Y-stent placement only (arrows in D).
