Which condition is a vascular ring anomaly listed as a differential for regurgitation?

• A. Vascular Ring Anomaly
• B. Hiatal Hernia
• C. Esophageal Foreign Body
• D. Spirocerca Lupi

Answer: (A)

Vascular ring anomalies cause regurgitation because a congenital arrangement of the great vessels forms a ring around the esophagus (and sometimes the trachea), producing a functional obstruction. This is a classic cause to consider when a patient, especially a young animal, regurgitates after feeding. The esophagus is constricted at the thoracic inlet, making it difficult for food to pass into the stomach, which leads to repetitive regurgitation rather than true vomiting.

Choosing a vascular ring anomaly as the answer fits the scenario because the question is asking for a condition that is itself a vascular ring anomaly listed as a differential for regurgitation. Other options point to different mechanisms—hiatal hernia involves gastroesophageal reflux rather than a ring around the esophagus, an esophageal foreign body is a discrete obstructing object, and Spirocerca lupi causes nodular or constrictive esophagitis from parasite burden—not a vascular ring.