Vaginal ultrasound is of great importance in the examination of gynecological diseases: 1. It can detect cervical lesions, such as cervical nuchal translucency, cervical hypertrophy and cervical tumors, etc. 2. Vaginal ultrasound can clearly detect the condition of the uterus, such as the thickness of the endometrium, endometrial polyps, uterine effusion, uterine fibroids, endometriosis, etc. The results are more accurate and clearer than those of abdominal ultrasound, The results are more accurate and clearer than those of abdominal ultrasound. 3. can detect tubal and ovarian related lesions, such as thickened fallopian tubes and ovarian cysts. 4. can detect the development of follicles and guide normal conception. 5. can detect ectopic pregnancies, such as those in the fallopian tubes and ovaries. 6. can detect the development of the gestational sac through vaginal ultrasound in early pregnancy, and can guide early termination of pregnancy, such as medical abortion or surgical abortion. or surgical abortion, etc.