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Difficulty in determining if a given axial computed tomographic (CT) image is still in the aorta or passing partially through the aorta and the left ventricular outflow track. This factor can lead to gross misinterpretations of aortic diameter. A and B differ by only one CT level, yet they yield markedly different diameters. Is the lower frame still in the aorta? Does it represent the dimension of the sinuses, or does it run obliquely through both aorta and left ventricular outflow tract? It can be difficult or impossible to ascertain these answers on a purely axial technique. From Elefteriades and Farkas.57 Source: Chapter 106. Diseases of the Aorta, Hurst's The Heart, 13e Citation: Fuster V, Walsh RA, Harrington RA. Hurst's The Heart, 13e; 2011 Available at: http://mhmedical.com/ Accessed: May 10, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved