Mixed echogenic mass in the right posterior uterus may be ectopic pregnancy, adnexal mass, pelvic inflammatory mass, etc. 1. Ectopic pregnancy: a common obstetrics and gynecology emergency abdomen, manifested by menopause, abdominal pain and irregular vaginal bleeding, ultrasound examination of the uterine cavity does not see the gestational sac, can be seen in the uterus right posterior to the mixed echogenic mass, and even see the yolk sac, the fetal buds and fetal heart, etc., combined with the history of the disease, ultrasound examination and blood HCG (human chorionic gonadotropin) test can help diagnosis. 2. Adnexal mass: such as ovarian teratoma, junctional plasmacytoma, etc., which can also be manifested as ultrasound suggestive of a mixed echogenic mass in the right posterior uterus, and the adnexal mass can be palpated on examination, which can be diagnosed by combining with the medical history, examination and ultrasound examination. 3. Pelvic inflammatory masses: such as tubo-ovarian masses, can also be manifested as a mixed echogenic mass in the posterior uterus, accompanied by lower abdominal pain, increased vaginal discharge, etc., and the adnexal area can be palpated with obvious tenderness, and can be accompanied by fever, etc., which can be diagnosed by combining the clinical manifestations, ultrasonography, and routine blood tests. When ultrasonography suggests a mixed echogenic mass in the right posterior part of the uterus, it is necessary to find out the cause under the guidance of the doctor and deal with it actively.