Figure 8. Multiple urothelial carcinomas involving the collecting system and proximal ureter. (a) Intravenous urography shows a filling defect (arrow) in the proximal ureter. Although abrupt cut-offs of the collecting systems (arrowheads) are noted, the presence or absence of a mass is unclear. (b) CT urography using maximum intensity projection directly visualizes masses (arrowheads) in the collecting systems as well as in the proximal ureter (arrow). (c) Virtual endoscopy at the level of the proximal ureter shows an intraluminal mass (arrows). (d) Virtual endoscopy at the level of the renal pelvis shows a mass (arrows) filling the infundibulum and protruding into the pelvis. Note a normal infundibular lumen (asterisk).