Figure 7a. Transitional cell carcinoma of the left ureter with associated left hydronephrosis in a 77-year-old woman. (a) Axial nephrographic-phase CT scan demonstrates left hydronephrosis (arrowheads) with associated delayed medullary enhancement (arrows). (b) Axial nephrographic-phase CT scan demonstrates left hydroureter (arrowheads). (c) Axial nephrographic-phase CT scan obtained several centimeters below b demonstrates an enhancing mass in the ureter (arrow). (d) Coronal excretory-phase reformatted image demonstrates left hydronephrosis and hydroureter (arrowheads) with an obstructing soft-tissue mass in the ureter (arrow).