[Relationship between a benign fibroepithelial polyp and a pelvic nephroblastoma: report of a case].

The purpose of this paper is to report one case of left pyelic Wilms' tumour in a 17-year old male patient. Pre-operative diagnosis was complicated by a background of prior surgery on the same kidney due to a benign fibroepithelial polyp. The possible concomitences are analyzed while the relevance of an extensive pathoanatomical study to avoid possible diagnostic errors is emphasized.