[Inverted papilloma of the renal pelvis: presentation of a case].

Contribution of a new case of urothelial inverted papilloma of rare location. Its invariably benign character and resolution with conservative surgery, forces to bear in mind this possibility when encountering pelvic repletion defects which can be mistaken, even after exfoliative cytologies, for low-degree transitional carcinomas, there being necessary to exhaust all procedures within our grasp in order to establish a diagnosis prior to definite surgery.