A case of spermatic arteriovenous anastomosis in the horse.

This research article discusses a unique case of an arteriovenous anastomosis in the spermatic cord of a horse, which was discovered during a surgical procedure to remove an abdominal testis. After the surgical removal, the horse showed significant improvement in its behavior and performance.

About Arteriovenous Anastomosis

• An arteriovenous anastomosis is a pathway, or connection, between an artery and a vein, allowing blood to bypass the usual route through capillaries. In this unusual case, the anastomosis was observed between the spermatic artery and vein in a horse.

Case Description

• The studied horse displayed unusual behavior prior to the surgery – the desire to rear after exercise and difficulty standing on three legs while being shod. These unusual behaviors were attributed to the presence of an undescended testis in the horse’s abdomen.
• During the surgical procedure to remove the undescended testis, it was observed that a sizeable anastomosis had formed between the spermatic artery and vein.

Post-Surgery Observations

• The study notes that after the removal of the mass (abdominal testis), there was both an immediate and significant change in the horse’s behavior and performance.
• The horse no longer attempted to rear after exercising, could stand on three legs for a longer duration while being shod, and an overall enhancement in its demeanor and physical conformation was observed.
• This remarkable improvement indicated that the discovered anastomosis and the undescended testis were contributing to the pre-operative behavioral issues of the horse.

Implications of the Research

• This study highlights the importance of thorough surgical examination in cases of unexplained animal behavior, as physical anomalies such as an arteriovenous anastomosis can contribute to behavioral issues or compromised performance.
• The study also sheds light on the possible impact of testicular masses on the behavior and performance of horses, implying that surgical removal could be beneficial in certain cases.