J Reprod Med
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To demonstrate the postnatal investigation, treatment and outcome of infants with hydronephrosis prenatally diagnosed by ultrasound between 1994 and 1996. ⋯ When the fetal renal pelvis was < 15 mm on prenatal ultrasound, it never progressed. Prenatally diagnosed hydronephrosis may be safely observed, and surgical correction should be performed only if renal compromise occurs.