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Related Experiment Videos

The ureteric ring.

P Dure-Smith1, T E Wiley, R D Suh

  • 1Radiology Service, Jerry L. Pettis Memorial VAMC, Loma Linda, CA 92357, USA and Department of Radiology, Loma Linda University Medical Center, Loma Linda, CA 92357, USA.

Abdominal Imaging
|July 3, 1999
PubMed
Summary
This summary is machine-generated.

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Ureteric rings are nonobstructive, ring-like narrowings in the upper ureter, often seen in neonates. These transient structures are thought to result from circular muscle contraction.

Area of Science:

  • Urology
  • Pediatric Urology
  • Radiology

Background:

  • A ureteric ring is a smooth, concentric narrowing in the upper ureter.
  • It is typically nonobstructive and can be transient and bilateral.
  • Ureteric rings are observed across all age groups, with a notable prevalence in neonates.

Purpose of the Study:

  • To describe the characteristics and potential etiology of ureteric rings.
  • To highlight their common occurrence in neonates.
  • To differentiate ureteric rings from obstructive ureteral anomalies.

Main Methods:

  • Review of imaging studies demonstrating ureteric rings.
  • Correlation of imaging findings with clinical presentation.
  • Histopathological correlation where available (though often inferred).

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Main Results:

  • Ureteric rings present as smooth, concentric, ring-like narrowing in the proximal ureter.
  • They are nonobstructive and may resolve spontaneously.
  • A slight female predominance is noted, and they are frequently seen in neonates alongside other transient urinary tract changes.

Conclusions:

  • Ureteric rings are a distinct radiological finding with a characteristic appearance.
  • The current hypothesis suggests they result from the contraction of ureteral circular muscle.
  • Their nonobstructive nature and transient presentation are key diagnostic features.