Figure 1: 27-millimetre Aneurysm. A, Circulus 3T TOF-MRI shows a hypointensity surrounding the aneurysm, asterisk indicating the aneurysm wall. B in situ. C, 0.5x magnification IHC COX-2 staining (48.54 % coverage of positive cells), asterisk indicating in both slides positive stained aneurysm wall. D, 0.5x magnification Perls’s Prussian blue.