FIG 2. Number 9 aneurysm in Matrix group, 10-week implant.

A, Anteroposterior DSA of the brachiocephalic artery shows a wide-necked aneurysm.

B, Anteroposterior DSA obtained immediately after embolization with Matrix coils shows the aneurysm is nearly completely occluded.

C, Anteroposterior DSA obtained 2 weeks after embolization shows slight coil compaction.

D, Hematoxylin and eosin stain; original magnification, x1.3. Coronal section obtained through the aneurysm cavity. Marked microcompaction and unorganized thrombus are shown. There is no tissue across the aneurysm neck.

E, Hematoxylin and eosin stain; original magnification, x25. Magnification of the area shown in panel D. Dense cellular infiltration near coils in the dome is seen.