[Transitional cell carcinoma in a retrocaval ureter]

We report a case of duplicated inferior vena cava and right retrocaval ureter with a urothelial tumor. The embryonal, clinical and diagnostic aspects of this disease entity are discussed. CT permitted noninvasive visualization of the retrocaval ureter and the urothelial tumor. We underscore the usefulness of the foregoing imaging technique versus the more invasive techniques such as cavography and ascending pyelography.