To evaluated the effects of MPO inhibition on aneurysm growth, wall inflammation, and healing, rabbits were treated with 4-aminobenzoic acid hydrazide (ABAH, an irreversible inhibitor of MPO which has been used in vivo for many diseases, including subacute stroke [30], nonalcoholic steatohepatitis [31], ischemic stroke [32], multiple sclerosis [33]). Here, MPO is linked to multiple sclerosis.