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Updated: Jul 11, 2026

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
Ureteral xanthine calculus and aberrant umbilical artery causing ureteral obstruction
A Frankenschmidt1, M Pohl, L B Zimmerhackl
1Department of Urology, University Hospital Freiburg, Germany. FS@CH11.UKL.UNI-FREIBURG.DE
Abstract:
A 30-month-old girl presented with gastrointestinal symptoms and a febrile urinary tract infection. Sonographic and radiographic imaging demonstrated left hydronephrosis due to a radiolucent ureteral stone. Surgical exploration identified an aberrant, patent left umbilical artery causing ureteral obstruction. Stone and urine analyses revealed hereditary xanthinuria that had not previously been recognized in this child and her family.
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