Grading of Hydronephrosis: An Ongoing Challenge

Area of Science:

• Pediatric Urology
• Radiology
• Nephrology

Background:

• Accurate hydronephrosis grading is crucial for managing UPJ anomalies in children.
• Existing grading systems (AP diameter, SFU, radiology, UTD) lack consensus and can be misleading.
• Subjectivity and variability in current methods lead to delayed treatment or unnecessary surgeries.

Purpose of the Study:

• To introduce and evaluate the upgraded Onen hydronephrosis grading system for UPJ anomalies.
• To address the limitations of existing grading systems in determining hydronephrosis severity.
• To differentiate infants requiring surgical intervention from those suitable for conservative management.

Main Methods:

• Review and analysis of existing hydronephrosis grading systems.
• Development of the Onen grading system based on renal suborgan anatomy and physiology.
• Evaluation of the Onen system's accuracy, sensitivity, and specificity in prenatal and postnatal cases.

Main Results:

• Existing systems like AP diameter, SFU, radiology, and UTD have significant limitations and variability.
• The Onen grading system provides detailed findings of renal damage.
• The Onen system accurately identifies infants needing surgery versus conservative follow-up.

Conclusions:

• The Onen grading system overcomes the disadvantages of previous methods.
• It offers a more accurate, reproducible, and sensitive/specific approach to grading UPJ-related hydronephrosis.
• This leads to safer follow-up and prompt, appropriate treatment for pediatric hydronephrosis.