Fig. 3.

Companion cases of two different adult patients presenting with microscopic hematuria demonstrating the utility of the excretory phase in delineating early excretion on nephrographic phase versus enhancing mass in the renal pelvis. a Nephrographic phase coronal reformatted image demonstrates high density in the renal pelvis (arrow), which could be early excretion or enhancing mass. b Excretory phase coronal reformatted image demonstrates this corresponds to a filling defect (arrow), and was in fact an enhancing soft-tissue mass, later confirmed to be urothelial carcinoma. c Nephrographic phase coronal reformatted image in a different patient demonstrates similar high density (arrow) in the renal pelvis; however. d excretory phase shows this area opacifies with contrast (arrow) and confirms this as early excretion of contrast on the nephrographic phase