FIG 1. Number 3 aneurysm in Matrix group, 2-week implant.

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

B, Anteroposterior DSA obtained immediately after embolization with Matrix coils shows near-complete occlusion of the aneurysm.

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

D, Hematoxylin and eosin stain; original magnification, x1.5. Coronal section obtained through the aneurysm cavity. Microcompaction and inflammation along neck are shown.

E, Hematoxylin and eosin stain; original magnification, x25. Magnification of the area shown in panel D; substantial inflammation is shown along neck.