Fibroepithelial polyps of the ureter are benign tumors arising from mesodermal tissue in the ureter wall.They are extremely rare lesions that can cause ureteropelvic junction obstruction in children.

• 摘要输尿管纤维上皮息肉是来自中胚层组识，且极少造成儿童肾盂输尿管结合处阻塞。