<unk>  is an autosomal dominant disorder of large arteries.  There is a degenerative breakdown of collagen, elastin, and smooth muscle caused by aging which contributes to the weakening of the wall of the aorta.   This weakening of the wall of the aorta can result in the formation of an aneurysm.
Cystic medial necrosis
Multifocal fibrosclerosis
Arteriosclerosis obliterans
Coronary artery calcification
Libman-Sacks endocarditis
Syphilitic aortitis
Cardiac amyloidosis
Cholesterol pericarditis