Intracavitary ultrasound involves the insertion of a Doppler probe through the body’s uterine cavity, esophagus, and intestines to scan the adjacent organs. Because it is closer to the adjacent organs, it displays a clearer image and helps to make a clear diagnosis. The probe enters through the uterine cavity to examine the uterus, adnexa, and other gynecological problems. The probe enters through the esophagus to examine the esophagus, stomach, and cardiography. The probe enters through the rectum to examine the anus, rectum, and male prostate diseases. The visualization is very clear and the diagnosis rate is high.