A 38-year-old woman complains of a tensive pain in her lower abdomen and the small of her back that is observed within the last month and intensifies on the day before menstruation Premenstrual dark bloody discharge was observed She has a history of four medical abortions and one birth Ultrasound shows isolated foci of increased echogenicity in the myometrium, increased anteroposterior size of the uterus, and round hypoechogenic inclusions 2 mun in diameter: What is the most likely diagnosis in this case?