Figure 2: Largest (40-millimetre) aneurysm. SWI MRI at 1T a with hypointensity (A), not as strong as in the SWI 7T MRI (B), asterisk indicating the aneurysm wall. This hypointensity correlates with the high iron deposition in the Perls’s Prussian blue staining (C, 40x magnification). COX-2 positive cells cover 79.98 % of the 40x magnification IHC slide (D).