Fig. 1

A 45-year-old man with Marfan’s syndrome post aortic valve replacement with a fusiform ascending aortic aneurysm. Measurement of ascending thoracic aorta dimension (double arrows) in an axial plane (a) will yield erroneous values due to oblique orientation relative to the centerline of the aorta, as demonstrated on sagittal (red line, b) and coronal (red line, c) multiplanar reformats (MPRs). Three-dimensional segmented volume rendered (VR) image of the thoracic aorta (d) demonstrates the site of measurement (line)