Natural history
Aneurysms may progress in size as a result of gradual wall weakening [6], with rupture occurring at the end of the growth spectrum. Rupture risk significantly increases when AAA diameters exceed 4.5 cm in women and 5.5 cm in men [7] (Table 1).

Table 1: Annual rupture risk according to abdominal aortic aneurysm diameter.

References: Radiology, Université de Montréal, CHUM Hôpital Saint-Luc - Montreal/CA, adapted from Brewster DC et al. (2003) Guidelines for the treatment of abdominal aortic aneurysms. J Vasc Surg 37:1106-1117

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