Imaging findings in fibroepithelial polyps causing ureteropelvic junction obstruction: report of one case.

Fibroepithelial polyps causing ureteropelvic junction obstruction are rarely reported in the pediatric age group. We report a 9-year-old boy who had ureteropelvic junction obstruction that proved to be owing to benign fibroepithelial polyps. Intravenous pyelography showed hydronephrosis with filling defects at the left ureteropelvic junction. Operative exploration revealed several finger-like polypoid neoplasms obstructing the lumen. The involved segment was resected and a dismembered pyeloplasty was performed. Fibroepithelial polyps were diagnosed by histology. The clinical imaging findings, features and methods of surgical treatment of this rare lesion are discussed.