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FIG 5. Pathologic examination after alginate embolization.
A, Photomicrophotograp of axial section of canine lateral wall aneurysm obtained 3 weeks after endovascular alginate embolization. Alginate is seen as black material. The neck is covered by neointima of variable thickness. Some alginate covered with neointimal tissue protrudes inside the carotid artery (arrows) (hematoxylin and eosin; original magnification, x20). S, suture between carotid and aneurysm; a, carotid arterial wall; N, region of the neck of the aneurysm.
B, Photomicrograph of axial section of lateral wall porcine aneurysm obtained 3 weeks after endovascular alginate embolization. Note very thick neointima contiguous with fibrous replacement of clot surrounding alginate coils (Movat’s pentachrome stain; original magnification, x20). a, carotid arterial wall; N, region of the neck of the aneurysm; Alg, alginate within partially organized clot; S, suture between carotid and aneurysm.
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