Uterine intussusception in a pet rat (Rattus norvegicus)

Uterine intussusception is defined as the uterus telescoping onto itself. This condition has been rarely described in animals, and when it occurs, is often associated with post‐partum or pregnant animals. This case report describes the diagnosis and treatment of a uterine horn intussusception in a 1‐year 7‐month‐old, female, entire nulliparous pet rat (Rattus norvegicus). The rat presented for a 1‐day history of sanguineous vaginal discharge. An exploratory laparotomy was performed, and the rat was diagnosed with a firm, off‐white approximately 1 cm cervical mass and a left uterine horn intussusception. An ovariohysterectomy was performed for therapeutic and diagnostic purposes, and the mass was diagnosed as a benign endometrial stromal polyp on histopathology. Ten days post‐operative, the surgical incision developed a bacterial infection, which resolved with a course of amoxicillin/clavulanic acid. No further post‐operative complications occurred. The rat continues to do well 10 months after surgery.