Things may not go as planned: The role of aortoiliac dilation and elongation during the estimation vascular structures' anatomical course.

•Variation of aortic morphology such as aortic dimensions, branching points, and correlation with adjacent structures is highlighted.•The mechanism of variance relies on the diseases such as arteriosclerosis, syphilis and hypertension.•Patients with hypertension, atherosclerosis, and aortic aneurysm should be excluded from the study because of the variation of aortic morphology is concluded.