B ultrasound left ovary display is not clear, mainly based on such a situation, we know that the intestine and uterus are inside the pelvis, ultrasound is afraid of the presence of gas, may be pregnant women come to do the examination when there is no defecation, or accumulation of gas and other intestinal gas buildup is too much, the buildup of excessive gas will interfere with ultrasound imaging. The rectum is located on the left side, and the sigmoid colon is also on the left side, so often the gas in the rectum and sigmoid colon will cause some interference with the ovaries, especially some pregnant women who come to do the examination in the afternoon, and the intestines are not very well prepared after eating, which may lead to the left side of the ovary due to the interference of the gas does not show clearly. There is another situation when we need to check through transabdominal examination, it may be related to the bladder filling, but the main thing is the interference of intestinal gas, in this case, we can suggest her to come back the next day after the bowel movement.