Figure 3c: Transverse CT images obtained in a 75-year-old man treated with endovascular aneurysm repair. (a) Unenhanced CT image allowed exclusion of any endoleak, thereby helping identify a calcification within the thrombus (arrows). (b) Arterial and (c) delayed phase CT images showed a high-attenuation area was present outside the graft but within the aneurysmal sac; this was diagnosed as endoleak in reading sessions A and C (arrows). The absence of endoleak was confirmed with the reference standard.