Fan T, et al. - In reconstructed epicardial coronary arterial trees of 61 patients with coronary artery aneurysms (CAAs) caused by atherosclerosis, morphometric and hemodynamic analyses were carried out. To improve the risk evaluation of CAAs, a two-step analysis method was used, ie, coronary artery bifurcation confers major risk for the CAA followed by high aneurysm shape index (L/W, where L and W refer to the aneurysm length and maximum diameter, respectively). Researchers found a higher occurrence of myocardial ischemia relevant to abnormal hemodynamic parameters in patients with the CAA covering a bifurcation vs those with the CAA in one vessel. The two-step analysis method was supported by morphometric and hemodynamic analyses. These findings offer a clinical rationale for the noninvasive evaluation of CAAs.