How do you identify the level of obstruction? If necessary, how can the function of a kidney be demonstrated in obstruction? What are the causes of hydronephrosis? What is hydronephrosis? What is the most common cause of unilateral hydronephrosis in children? Book traversal links for Hydronephrosis ‹ How should an abdominal mass in a neonate be evaluated? Up How do you identify the level of obstruction? ›