Severe internal hemorrhage resulting from transvaginal ultrasound-guided follicle aspiration in a mare

Transvaginal ultrasound-guided follicle aspiration (TVA) is becoming a more widely utilized procedure for obtaining oocytes from mares for both research and clinical applications because it is practical, repeatable and minimally invasive. Although the incidence of complications associated with TVA is low, the risk of serious complications cannot be completely eliminated. In this report, we present a case in which severe internal hemorrhage occurred as a result of TVA in a mare.