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Fig. 7 —35-year-old woman with endometrial adenocarcinoma. Confluent low-attenuation retroperitoneal metastatic deposits (arrow) have appearance similar to that of retroperitoneal fibrosis. CT scan shows this soft tissue is centered on lower infrarenal aorta, has relatively smooth margins, and does not elevate aorta from spine—features that may allow differentiation of malignant from benign retroperitoneal fibrosis. Note associated left hydronephrosis (arrowhead).