Ovarian Torsion in a Pet Rabbit (Oryctolagus cuniculus): A Case Report

Ovarian torsion (OT) is a condition that can affect both humans and animals, although it is less common in the latter, with very few cases documented in the literature. To our knowledge, no previous reports have documented the occurrence of this condition in rabbits. In this study, we present the first documented case of spontaneous OT in a 2-year-old female intact rabbit. The patient was brought to the clinic for a routine check-up, during which a firm, large abdominal mass was palpated. Subsequent ultrasound examination of the abdomen revealed the presence of a large, hypoechoic, non-vascularized mass occupying the majority of the caudal abdomen. A computed tomography (CT) scan further confirmed the presence of a heterogeneous mass exhibiting the Whirlpool sign, which is characteristic of organ torsion. Upon laparotomy, an enlargement of the right ovary was observed, characterized by twisting of the ovarian pedicle, consistent with the mass detected via ultrasound and CT scan. Ovariohysterovaginectomy was performed, and the mass was subsequently analyzed. Microscopic analysis of the mass revealed predominantly necrotic tissue, with only a few ovarian epithelial cells present. The underlying cause of the OT described in this study remains unclear. However, it is plausible that a previous neoplastic condition or ovarian necrosis led to an increase in the size and weight of the mass, ultimately resulting in the twisting of the supporting structures.