Abdominal pain is not always what it seems La obstrucción de la unión pieloureteral es la causa más frecuente de hidronefrosis en la infancia. El uso de las ecografías prenatales ha provocado un cambio en la presentación clínica de la hidronefrosis, permitiendo el diagnóstico antes de que existan síntomas. Pero existen casos de diagnóstico tardío, en la edad preescolar o escolar. Ureteropelvic junction obstruction is the most common cause of pediatric hydronephrosis. The typical presentation of hydronephrosis has changed since the widespread use of antenatal ultrasonography and nowadays diagnosis may be set before symptoms begin. But there are cases of late diagnosis in preschool or school age.
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