My Daughter Had Ultrasound To Check Placement Of Her Merina

My daughter had ultrasound to check placement of her merina on the ultrasound it states several localized sub centimeter cysts within the endometrium of the lower uterine segment at the inferior aspect of the intra uterine device differential considerations include localized cystic endometrial atrophy location is atypical for nabothian cysts or adenoma malignum which are considered less likely. What does this mean?