I agree, but there are rare diseases that occur so infrequently that even in the best centers there are not enough cases treated for accurate statistical report. Aortal aneurism once was very frequent disease since it developed on the third stage of syphilis. Nowadays, syphilis is a rare disease
per se, and it is being treated by antibiotics long before any complications develop. Arteriosclerosis may be a cause, but the condition does not develop so frequently in the patients with arteriosclerosis. The other reasons include:
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Genetic: There is a familial tendency to aortic aneurysms. This tendency is at least in part genetic. Among the inheritable causes of aortic aneurysms are connective tissue disorders such as Ehlers-Danlos syndrome and Marfan's syndrome.
Post-traumatic: After physical trauma to the aorta.
Arteritis (inflammation of blood vessels) as occurs in Takayasu disease, giant cell arteritis, and relapsing polychondritis.
Congenital malformation of the aorta (aneurysms tend to develop just beyond the narrowing of a coarctation of the aorta; also with what is called a ductus diverticulum).
Mycotic (fungal) infection which may be associated with immunodeficiency, IV drug abuse, heart valve surgery.
, and these conditions are not so frequent either.
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