FIG 3. Scanning electron microscopic images of coils after embolization.

A, An uncoated platinum microcoil shows limited thrombic formation 30 minutes after delivery (magnification x350).

B, A collagen-coated platinum microcoil shows massive thrombic formation 30 minutes after delivery (magnification x310).

C, An uncoated platinum microcoil shows endothelial cells beginning to proliferate on the fibrous tissue formed on the coil within 1 week of embolization (magnification x200).

D, An uncoated platinum microcoil surface is completely covered with endothelial cells within 4 weeks of embolization. Organized tissue is seen under the endothelial cells (magnification x160).

E, A collagen-coated platinum microcoil surface is covered with endothelial cells within a week of embolization (magnification x280).

F, A collagen-coated platinum microcoil shows a typical mosaic pattern of flat, elongated, spindle-shaped endothelial cells throughout its surface 2 weeks after embolization (magnification x290).