When a cystic mass is found on the left side of the adnexa during a vaginal ultrasound or abdominal ultrasound, it may be due to a number of reasons, such as inflammatory stimulation in the body or excessive frequent medical abortions or abortions, which can cause endometriosis and may result in a cystic mass on the left or even the right side. At the same time, when the endocrine hormones in the body change, it may affect the function of the ovaries, which may also cause the occurrence of cystic masses. When a cystic mass appears in the left adnexal area, if it is less than 3cm, it is recommended to have regular follow-up and observation, and to have blood tests for tumor markers to see if there is an increasing trend. If it is more than 4 cm, laparoscopic removal of the cystic mass is recommended to help restore normal function so that ovulation is not affected.