FIBROEPITHELIAL POLYP OF THE RENAL PELVIS

Benign fibroepithelial polyps of the renal pelvis are rare. Because of suspected malignancy in imaging procedures an ureteronephrectomy was carried out in the reported case. Histology, however, yielded no evide nce of malignancy. The diagnosis of benign fibroepithelial polyp was e ntertained. It remains an open question whether the pathologic changes represent a hamartoma or a reactive postinflammatory process, reveali ng primitive myxoid stroma within the polypous portion and increasing fibrosis with diffuse submucosal involvement of the ureteral basis.