Figure 3.

A 65-year-old female with a renal mass. (a) Contrast enhanced CT in the corticomedullary phase shows a small hypodense right renal lesion (arrow) which is obscured by the relatively unenhanced adjacent renal medulla. (b) CT image in the nephrographic phase shows the same lesion (arrow) to a much better advantage surrounded by the homogenously enhancing renal parenchyma. The patient underwent active surveillance for this lesion, which remained stable for one year. The patient was then lost to follow up.