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Figure 2a: Transverse CT images in a 72-year-old woman treated with endovascular aneurysm repair. (a) Arterial phase image did not demonstrate any high attenuation area beyond the graft. (b) Endoleak was diagnosed only on the basis of findings on a delayed phase image (low-flow leak). Findings at reading sessions A and B were interpreted as negative for endoleak. An endoleak on the posterior side of the aneurysmal sac (arrows) was confirmed with the reference standard.