The ureteric ring.

Abdom Imaging

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.

Published: September 1999

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.

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Source
http://dx.doi.org/10.1007/s002619900530DOI Listing

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