Persistent Right Aortic Arch (PRAA)

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Key Points

Persistent right aortic arch (PRAA) is the most common vascular ring anomaly (VRA) in dogs that occurs when the right aortic arch persists and the left regresses
- The abnormal vessels and ligamentum arteriosum create a band which traps and constricts the oesophagus
It’s most common in large and giant breed dogs such as German Shepherd Dogs, Great Danes and Irish Setters
Megaoesophagus develops cranial to the obstruction, resulting in regurgitation, poor weight gain and stunted growth
Definitive diagnosis requires imaging to visualise the anomaly
Surgical correction of the abnormality is required to release the oesophagus

Differential Diagnoses

Megaoesophagus
Oesophageal stricture
Oesophageal foreign body
Hiatal hernia

Educational content only. This factsheet is for general veterinary education and is not a substitute for professional veterinary advice, diagnosis, or treatment. Not for use in an emergency — contact a veterinarian or emergency service. Full disclaimer →