FIG 4. Exemplary long-term results from case 6, in which death occurred 272 days after treatment (Table 1).

A, Angiogram obtained before treatment of a basilar tip aneurysm.

B, Angiogram obtained after treatment of a basilar tip aneurysm.

C, Histologic 5- to 10-µm-thick section of plasticized aneurysm depicts scar-like connective tissue in the former aneurysm lumen 272 days after treatment. The scale can be extrapolated from the two coil diameters of 0.010 and 0.015 in.

D, x20 magnification of the red inset shown in C depicts vascularized connecting tissue surrounding platinum coils (arrow).

E, x40 magnification of the white inset shown in C depicts foreign body giant cells with multiple nuclei adjacent to coils (arrows).

F, x10 magnification of the area indicated by the dashed lines depicts scar tissue covered by a layer of long slender cells, resembling endothelium, demarcating the aneurysm orifice against the parent vessel (arrows).