The vaginal ultrasound report often suggests that the left ovary or right ovary, or even bilateral ovaries show unclear, the specific reasons are as follows: 1, ultrasound inherent defects, because ultrasound is a kind of sound waves, mainly based on acoustic imaging, vaginal ultrasound frequency is relatively high, the resolution is relatively high, but the depth of penetration is relatively shallow, generally 4-5cm within the ultrasound to see more clearly, 4-5cm or more, especially the 7-8cm Above 4-5cm, especially 7-8cm, for example, the probe is here, and the ovaries are located near the pelvic side wall, far away from the probe, more than 7-8cm, the effect of looking at the ovaries is very poor. Even if you see, the resolution is also very low, is caused by the inherent defects of ultrasound, the ovary can not be too far away; 2, the ovary itself anatomical characteristics of the pelvic cavity has a lot of intestines, if the ovary is just around the periphery surrounded by intestinal tissues, vaginal ultrasound is relatively difficult to see, because the intestinal tract inside the gas, as well as the intestinal contents of fecal matter, affecting the observation of the ovary; 3, the other, the position of the ovary after uterine surgery to change, especially uterine After uterine surgery or ovarian surgery, the ovaries are in a higher position, which makes routine ultrasound examination more difficult, and often the ovaries are not clear on ultrasound. It is best to combine abdominal ultrasound to find the ovaries, but there are some patients whose ovaries are really difficult to find.