title: Benign pelvi-ureteral tumors in children.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008297:Male; D011127:Polyps / Q000000981:diagnostic imaging*; D011859:Radiography; D014516:Ureteral Neoplasms / Q000000981:diagnostic imaging*