Ovarian torsion is generally preceded by an ovarian mass. The corpus luteum is a small structure that forms in the ovary after the ovum that was released fails to fertilize. In reproductive women, this process occurs almost every month, which may result in the corpus luteal cysts that sometimes grow into large masses. https://www.brooklynabortionclinic.nyc/ovarian-torsion-obstetric-and-gynecologic-emergencies/