To investigate the outcome of melamine-related-calculus.~The change of calculus.~The change of obstruction features,including hydronephrosis and ureterectasia.~The change of the urinalysis.~To investigate the change of renal function in children with melamine-related-calculus during the follow up.~Creatinine, urea and uric acid.~α and β2 microglobulin.~To analysis the factors might be associated with the outcome.~The characteristics of patients: age, gender, and so on.~The characteristics of calculus: location, size, and so on.
The purpose of this study is to investigate the lesions, clinical features and outcome in young children with melamine-related-calculus.