[Fibrous epithelial polyps of the pyelo-ureteral junction in children. Presentation of 3 cases and review of the literature (33 cases)].

Primary ureteral tumors are rare and benign ones constitute only a small portion. Of the benign neoplasms, fibro epithelial polyps are probably the most common and could be considered to be an exceedingly rare cause of Hydronephrosis in children. The exact etiology of benign ureteral polyps is not certain but it is likely that they have a congenital one. They are mesodermal in origin and consist of a thick fibrous stalk covered by a layer of normal transitional epithelium. They are more commonly found in boys (80.6%), who present usually with abdominal pains or renal colics. Fibro-epithelial polyps often rise in the proximal ureter and renal pelvis, especially at the left side (69.4%). Radiographic signs are those of a non typical uretero-pelvic Junction obstruction. IVP and retrograde ureterogram usually demonstrate a long, thin, filiform, lucent filling defect within the ureteral lumen with moderate hydronephrosis. Appropriate treatment of these benign tumors is local excision with or without segmental resection. Prognosis should be considered as excellent without a report of recurrence. A review of the literature revealed 33 cases of ureteral polyps in children. We report here 3 additional cases of obstructing fibro epithelial polyps, observed in boys aged respectively 4, 8 and 9 years.