Felis ISSN 2398-2950

Vascular ring anomaly

Synonym(s): Persistent right aortic arch, PRAA, VRA

Contributor(s): Serena Brownlie, Philip K Nicholls, Kenneth Simpson, Penny Watson

Introduction

  • Very rare in cats.
  • Cause: most common - persistent right aortic arch (PRAA); less common - double aortic arch, anomalous right subclavian artery.
  • Signs: regurgitation on weaning to solid food, voracious appetite, aspiration pneumonia, smaller than litter mates.
  • Diagnosis: radiography shows esophageal dilation anterior to base of heart and constriction at heart base. Definitive diagnosis of anomaly requires angiography which is only occasionally performed to clarify complex or atypical anomalies.
  • Treatment: aggressive supportive therapy and surgical correction of anomaly.
  • Prognosis: depends on degree of megaesophagus Megaesophagus.

Pathogenesis

Etiology

  • Congenital: persistent right aortic arch (stricture caused by ligamentum or ductus arteriosus, pulmonary artery and dextraposed aorta), double aortic arches, anomalous subclavian arteries.

Pathophysiology

  • Esophageal stricture Esophagus: stricture  →   regurgitation of solid food (usually first seen at weaning)   →   poor growth and voracious appetite.
  • Esophageal cicatrization, megaesophagus Megaesophagus and esophageal hypomotility may develop - affect long-term prognosis.
  • Aspiration pneumonia - common complication Pneumonia.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Strathman J (1989) What is your diagnosis? Vascular ring anomaly. JAVMA 195 (5), 650-651 PubMed.
  • McCandlish I A, Nash A S, Peggram A (1984) Unusual vascular ring in a cat - left aortic ring arch with right ligamentum arteriosum. Vet Rec 114 (14), 338-340 PubMed.
  • Wheaton L G, Blevins W E, Weirich W E (1984) Persistent right aortic arch associated wtih other vascular anomalies in two cats. JAVMA 184 (11), 848-51 PubMed.


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