title: Extrarenal collecting system presenting as an abdominal mass in a child.
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D007668:Kidney / Q000002:abnormalities* / Q000000981:diagnostic imaging; D007682:Kidney Pelvis / Q000002:abnormalities; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging / Q000601:surgery; D014567:Urography