If the left ovary does not appear well on ultrasound, it is often due to the following reasons. The first is that the left ovary is not visible due to intestinal distention, which can be reviewed at intervals. Secondly, because the left ovary has been removed, the presence of the ovary cannot be detected by ultrasound, so it is recommended to give a comprehensive analysis with medical history. The third reason is that the left ovary may not be clearly visible due to ovarian atrophy, which is the reason why the left ovary is not visible on ultrasound. If necessary, ultrasound examinations can be performed at intervals in conjunction with the clinical history to find out whether the left ovary can be seen clearly by ultrasound.