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Fig. 2B —55-year-old man with retroperitoneal fibrosis. Axial oral and IV contrast-enhanced CT images show presence of low-attenuation mass anterior and lateral to aorta and iliac vessels, without anterior displacement of either aorta or inferior vena cava. Retroperitoneal mass obliterates fat plane between vessels and psoas muscle (arrows, A). Plaque bifurcates and follows common iliac arteries (arrowhead, B).