Olson SL, Wijesinha MA, Panthofer AM, et al. - Researchers sought to determine the growth rates and patterns of small abdominal aortic aneurysms (AAAs) as documented on serial computed tomography (CT) scans over 2 years. They conducted a cohort study and secondary analysis of the Non-Invasive Treatment of Abdominal Aortic Aneurysm Clinical Trial (N-TA ³ CT), a randomized, double-blind placebo-controlled clinical trial of 254 patients with 3.5- to 5.0-cm abdominal aortic aneurysms. Findings revealed average annual growth of 0.19 cm, and linear growth in 70% of the patients. Based on linear low growth patterns, they suggest that it is safe to extend surveillance of abdominal aortic aneurysms less than 4.25 cm to at least 2 years.