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Aneurysm expansion, and consequent endoleaks, after endovascular aneurysm repair (EVAR) is a major problem. Accurate prediction of aneurysm expansion is demanding for surgeons and remains difficult.Methods and Results:We retrospectively analyzed 157 cases of EVAR for abdominal aortic aneurysm (AAA) using a bifurcated main-body stent-graft. There were 62 cases of aneurysm shrinkage after EVAR, 63 cases of stable aneurysm, and 32 cases of aneurysm expansion. Type I endoleaks were significantly increased in the aneurysm expansion group (EXP) compared with the stable (STB) and shrinkage (SHR) groups (EXP: 15.6% vs. STB: 4.8% vs. SHR: 0%, P=0.005). Type II endoleaks were also significantly increased in EXP (EXP: 65.6% vs. STB: 36.5% vs. SHR: 6.5%, P<0.001). Aneurysm wall enhancement (AWE) on imaging, however, was significantly decreased in the EXP group (EXP: 18.8% vs. STB: 23.8% vs. SHR: 53.2%, P<0.001). In multivariate analysis, the occurrence of type II endoleaks significantly decreased (P<0.001) and that of AWE significantly increased the likelihood of aneurysm shrinkage (P=0.032).AWE following EVAR may be associated with aneurysm shrinkage.

circulation journal

Aneurysm Wall Enhancement Detected by Contrast Computed Tomography Scan Is Associated With Aneurysm Shrinkage After Endovascular Aneurysm Repair for Abdominal Aortic Aneurysm