FIG 3. Subject 3, aneurysm packed with collagen coil (2-week sample).

A, Histologic specimen showing the neck of the aneurysm covered by a thick layer of tissue consisting of nucleated cells (arrows). (Hematoxylin and eosin stain, original magnification x40.)

B, Histologic speciment showing dense blue staining indicates collagen deposition within the aneurysm cavity. Vascular channels are also present. (Trichrome stain, original magnification x100.).