The female internal genitalia include the vagina, uterus, fallopian tubes and ovaries, the latter two being called the uterine adnexa. A left adnexal cyst is a cystic mass of ovarian and fallopian tube origin on the left side, usually with an outer layer of cystic skin and a liquid content. There are many types of adnexal cysts, the common ones are physiological cysts, these cysts can disappear on their own with the change of female physiological cycle, it is generally recommended to review and observe the cysts after menstruation; inflammation caused by tubal pus and tubo-ovarian abscess, in the acute stage of inflammation, anti-inflammatory treatment should be carried out first, if the mass does not disappear or confined, surgery should be carried out, chronic inflammation caused by tubal fluid or tubo-ovarian cysts For pathological ovarian cysts, ovarian coronary cysts, ovarian chocolate cysts, etc., those with larger volume need surgery, and the surgical method depends on the type of cyst and the patient’s condition; smaller adnexal cysts can be reviewed regularly, and if they increase in size during observation, they need to be treated. If the cysts in the adnexal area are physiological, they do not need to be treated, but if they are pathological, larger in size or cannot be clearly defined, early surgery is recommended.