Prenatally diagnosed pelviureteric junction obstruction: a benign condition?

Area of Science:

• Pediatric Urology
• Neonatal Nephrology
• Medical Imaging

Background:

• Antenatally diagnosed pelviureteric obstruction (APO) is a common congenital anomaly.
• Short-term renal function in neonates with APO is generally good.
• Long-term functional outcomes and predictive factors for deterioration require further investigation.

Purpose of the Study:

• To evaluate medium-term renal function in neonates with APO.
• To identify factors predicting functional deterioration in these patients.
• To assess the natural history of APO managed expectantly.

Main Methods:

• Retrospective review of 160 cases of antenatally diagnosed unilateral pelviureteric obstruction (1985-1992).
• Renographic confirmation and assessment of differential renal function at 1-3 months.
• Expectant management with renographic follow-up at 24, 48, and 72 months for cases with initial function >40%.

Main Results:

• 140/160 (87.5%) neonates had initial differential function >40% and were managed expectantly.
• 135/140 (96.5%) of expectantly managed patients maintained good differential function at follow-up.
• Only 5/160 (3.5%) showed a decrease in differential function below 40%, unrelated to renographic curve type or hydronephrosis severity.

Conclusions:

• Antenatally diagnosed pelviureteric obstruction in neonates appears to have a benign natural history with preserved renal function in the medium term.
• Expectant management is effective for most cases with preserved initial differential function.
• The natural history may differ from that of older children presenting symptomatically.