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Obstructed left retrocaval ureter in a dog
  1. Tobias Schwarz1,
  2. Matthew Simpson1,
  3. Jimmy Saunders2 and
  4. Nick Bommer3
  1. 1Hospital for Small Animals, The University of Edinburgh Royal Dick School of Veterinary Studies, Roslin, UK
  2. 2Department of Medical Imaging of Domestic Animals, University of Ghent, Faculty of Veterinary Medicine, Merelbeke, Belgium
  3. 3Internal Medicine, Veterinary Specialists, Scotland, UK
  1. Correspondence to Dr Matthew Simpson; simpson.matthew{at}


Retrocaval ureters form due to a congenital malformation of the caudal vena cava. This anomaly has been reported in cats and is usually incidental. Retrocaval ureters are rare in dogs, but have been associated with ureteral obstruction. When presented with a dog with hydroureter and hydronephrosis, an obstructed retrocaval ureter should be considered as a rare differential. This case report describes a left retrocaval ureter causing ureterohydronephrosis diagnosed by CT.

  • computed tomography (CT)
  • companion animals
  • urinary tract
  • dogs
  • anatomy
  • diagnostic imaging
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  • TS and MS are joint first authors.

  • TS and MS contributed equally.

  • Contributors MS and TS contributed equally to this paper. MS and TS collated the information, drafted the manuscript and identified the case. Case information was contributed by all authors. The manuscript was read and approved by all authors.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement All data for this case report are included in the article.

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