Endometriosis is a condition where the uterine lining grows outside of the uterine cavity, commonly seen in the pelvic region, particularly above the ovaries. Therefore, ultrasound (B-ultrasound) examinations are primarily used for accuracy. The ultrasound may reveal a large mass on one side of the fallopian tubes or ovaries, with uneven content inside. During the ultrasound, it can also be observed that the capsule of the mass is intact. Additionally, during a gynecological examination, the doctor may also feel a mass in the adnexa.