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Fig. 4C —56-year-old man 1 month after descending thoracic aortic graft replacement for posttraumatic contained aortic rupture. Axial (B) and sagittal reformatted (C) CT scans 12 months after A show marked increase in amount of perigraft low-attenuation material (arrows). Patient, who had no symptoms and no clinical evidence of infection, was not treated for this imaging finding. Arrowhead indicates felt pledget at graft cannulation site.