Figure 2b. Coarctation of the aorta at nongated CT in a 25-year-old man with atypical chest pain. (a) Thick-section oblique sagittal MIP image shows a high-grade aortic coarctation (arrow). AoA = aortic arch, dA = descending aorta, PT = pulmonary trunk. (b) Thin-section volume-rendered image, obtained with reconstruction in an oblique left-posterior plane by using the cut-plane mode, demonstrates narrowing of the aortic isthmus (small arrow) and extensive collateral intercostal and nuchal arteries (large arrow).