Nonatheromatous Arteriosclerosis By George Thanassoulis, MD, MSc, McGill University; Haya Aziz, MD, McGill University Reviewed / Revised Apr 2022 | Modified Sep 2022 View Patient Education Key Points Topic Resources Mönckeberg Arteriosclerosis Nonatheromatous arteriosclerosis is age-related fibrosis in the aorta and its major branches.