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Unusual vascular ring anomaly in a foal
1Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan.
The Canadian Veterinary Journal = La Revue Veterinaire Canadienne
|January 14, 2005
Summary
A rare vascular ring anomaly, not the common persistent right aortic arch, caused esophageal obstruction in a young horse. This finding highlights the need for broader diagnostic considerations in equine veterinary medicine.
Area of Science:
- Veterinary Medicine
- Comparative Pathology
- Cardiovascular Anatomy
Background:
- Esophageal obstruction is a common clinical sign in horses, often caused by foreign bodies or strictures.
- Vascular ring anomalies are congenital defects affecting the aortic arch, potentially leading to esophageal or tracheal compression.
- The persistent right aortic arch is the sole documented vascular ring anomaly in equine species.
Observation:
- A 2.5-month-old filly presented with acute signs indicative of esophageal obstruction.
- The filly's condition necessitated euthanasia, allowing for a comprehensive postmortem examination.
- Necropsy revealed a vascular ring anomaly as the underlying cause of the obstruction.
Findings:
- The identified vascular ring anomaly was histologically and anatomically distinct from the persistent right aortic arch.
- This case represents a novel presentation of a vascular ring anomaly in horses, challenging existing literature.
- The anomaly's specific type and mechanism of esophageal compression were detailed.
Implications:
- This case expands the differential diagnoses for esophageal obstruction in horses.
- It underscores the importance of thorough postmortem examination in identifying rare congenital abnormalities.
- Further research into the embryological origins and prevalence of non-persistent right aortic arch vascular rings in horses is warranted.