AORTIC ANEURYSM is a topic covered in the Harrison's Manual of Medicine.

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Abnormal dilatation of the abdominal or thoracic aorta; in ascending aorta most commonly secondary to cystic medial necrosis (e.g., familial, Marfan’s syndrome, Ehlers-Danlos syndrome type IV); aneurysms of descending thoracic and abdominal aorta are primarily atherosclerotic. Rare causes of aneurysms are infections (syphilitic, tuberculous, mycotic) and vasculitides (e.g., Takayasu’s arteritis, giant cell arteritis).

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