Usually, a strongly echogenic mass visible in the endometrium without blood flow signal is seen in cases such as intrauterine devices, endometrial polyps, and submucosal fibroids of the uterus. 1. Intrauterine device: If a woman has a birth control device placed in the uterine cavity, the contrast of the device will appear as a result of strong echogenic changes during ultrasound examination. If the strong echogenic change of the birth control device is in the normal position, it can play an effective role in contraception. On the contrary, it may be the ultrasound manifestation caused by the detachment of the birth control ring or the displacement of the birth control ring. 2. Endometrial polyp: Due to the stimulation of various pathogenic factors, it may cause localized proliferation of the endometrium, resulting in endometrial polyp. During ultrasound examination, a strong echogenic mass can be seen. 3. Uterine submucous fibroids: a kind of uterine fibroids, most patients have no obvious symptoms. Its occurrence may be related to female hormones, race, genetics and other factors. Strong echogenic changes may be seen by doing ultrasonography. In addition, it is recommended that patients with strong echogenic masses visible in the endometrium and without blood flow signals should improve the relevant examinations under the guidance of the doctor in time and follow the doctor’s instructions for treatment to avoid delaying the condition.