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Kidney, Ureter, and Bladder (KUB) StudiesKidney, Ureter, and Bladder (KUB) studies are standard diagnostic imaging procedures used to assess the anatomy of the urinary system. They are commonly utilized for patients experiencing abdominal pain or urinary symptoms. By using a simple X-ray of the abdomen, KUB studies can reveal structural and pathological abnormalities within the kidneys, ureters, and bladder. These studies are particularly valuable in diagnosing kidney stones, urinary...
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Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
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A comparative study between two ultrasound classifications for postnatal urinary tract dilatation.

J Panach-Navarrete1, P Hernández-Rovira1, L Valls-González1

  • 1Servicio de Urología, Hospital Clínico Universitario de Valencia, INCLIVA, Instituto de Investigación Sanitaria, Facultat de Medicina i Odontologia, Universitat de València, Valencia, Spain.

Radiologia
|September 20, 2025
PubMed
Summary

The urinary tract dilatation (UTD) and Society for Foetal Urology (SFU) classifications predict spontaneous resolution of postnatal urinary tract dilatation. UTD classification also predicts surgical need, with older age increasing surgery risk.

Keywords:
Congenital hydronephrosisEcografíaHidronefrosis congénitaNefrología pediátricaPaediatric nephrologyUltrasound

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Area of Science:

  • Pediatric Urology
  • Medical Imaging
  • Nephrology

Background:

  • Congenital hydronephrosis is a common condition in newborns.
  • Accurate prediction of outcomes is crucial for management.
  • Existing ultrasound classifications aim to stratify risk.

Purpose of the Study:

  • To evaluate the predictive accuracy of the Society for Foetal Urology (SFU) and urinary tract dilatation (UTD) ultrasound classifications.
  • To determine if these classifications predict surgical intervention or spontaneous resolution of postnatal urinary tract dilatation.

Main Methods:

  • Retrospective observational study of 231 kidneys with congenital hydronephrosis.
  • Classification using SFU and UTD systems based on initial ultrasound scans (2008-2011).
  • Statistical analysis (univariate and logistic regression) to identify predictors of surgical need or resolution.

Main Results:

  • Spontaneous resolution observed in 41.5% of cases; 40.2% required surgery.
  • UTD classification (P2-P3) and older age predicted increased need for surgery.
  • Older age and high dilatation (UTD P2-P3, SFU 3-4) predicted lower likelihood of spontaneous resolution.

Conclusions:

  • Both UTD and SFU classifications effectively predict spontaneous resolution of urinary tract dilatation.
  • UTD classification is superior in predicting the need for surgery.
  • Older age at initial ultrasound is linked to higher surgical risk and reduced spontaneous resolution.