The ureteric ring.
A ureteric ring is a smooth, concentric ring-like narrowing occurring in the upper third of the ureter. It is nonobstructive and may be transient and bilateral. There is a slight female preponderance. They are seen in all age groups and are common in the neonate together with transient changes. A ureteric ring has a characteristic appearance and is believed to result from contraction of circular muscle.
Dure-Smith
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Radiology 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.
Wiley
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D000328:Adult; D000368:Aged; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction; D012189:Retrospective Studies; D014513:Ureter / Q000002:abnormalities* / Q000000981:diagnostic imaging; D014567:Urography