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Stratifying Antenatal Hydronephrosis: Predicting High-Grade VUR Using Ultrasound and Scintigraphy.

Niklas Pakkasjärvi1, Sofia Belov1, Timo Jahnukainen2

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A new scoring system accurately predicts high-grade vesicoureteral reflux (VUR) in antenatal hydronephrosis (AHN) using ultrasound and scintigraphy. This approach enhances diagnosis, reducing the need for invasive voiding cystourethrograms (VCUG).

Keywords:
antenatal hydronephrosisdiagnostic processrisk stratificationscintigraphyvesicoureteral reflux

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Area of Science:

  • Pediatric Urology
  • Diagnostic Imaging
  • Renal Physiology

Background:

  • Antenatal hydronephrosis (AHN) affects ~1% of prenatal ultrasounds.
  • Vesicoureteral reflux (VUR) is a complication in 15-21% of AHN cases, risking infections and renal scarring.
  • Accurate VUR diagnosis in AHN is challenging, often requiring invasive voiding cystourethrograms (VCUG).

Purpose of the Study:

  • To develop and validate a novel scoring system for predicting high-grade VUR in infants with AHN.
  • To improve diagnostic precision for VUR in AHN.
  • To reduce reliance on invasive diagnostic methods like VCUG.

Main Methods:

  • Retrospective analysis of renal ultrasonography, scintigraphy, and VCUG data from 124 infants (2003-2013).
  • Exclusion of cases with complex urinary anomalies.
  • Multivariate analysis to identify predictors of high-grade VUR.

Main Results:

  • High-grade VUR was present in 11% of the cohort.
  • Key predictors identified: visible ureter, reduced renal length, and decreased differential renal function (DRF).
  • A three-tier risk score demonstrated 86% sensitivity and 79% specificity for high-grade VUR (prevalence: 2.3% low, 22.2% intermediate, 75.0% high-risk).

Conclusions:

  • The developed scoring system effectively identifies high-grade VUR in AHN patients using objective parameters.
  • This non-invasive approach enhances diagnostic capabilities for AHN.
  • The system facilitates tailored, less invasive patient management by reducing VCUG dependency.