What is your diagnosis? Ovarian mass in a mare

Abstract

An 18-year-old Hanoverian mare was referred to the North Carolina State University Veterinary Hospital for removal of an intraabdominal mass after an initial assessment for a 6-month history of stallion-like behavior, including increased kicking, striking, biting, and bucking when riding. Rectal palpation and ultrasound revealed a large multicystic mass in the region of the right ovary. Physical exam