FIG 1. Rabbit aneurysm, 2 weeks postembolization.

A, Photomicrograph shows unorganized thrombus within the aneurysm cavity and across the aneurysm neck. Excellent tissue preservation was achieved in this setting of friable thrombus. (H&E; original magnification, 20x).

B, Higher magnification of aneurysm neck shown in panel A. Photomicrograph shows no endothelial cell coverage at aneurysm neck (H&E; original magnification, 100x).