A cystic mass in the right adnexal region refers to a cystic mass in the right ovary and fallopian tube region seen on ultrasound, which contains more fluid and no substantial components are seen, called a cystic mass. Gynecologic diseases are usually examined by gynecologic ultrasound. The right adnexal area includes the right ovary and fallopian tube, and the presence of a cystic mass in the right adnexal area suggests a lesion in the right ovary or fallopian tube. 1. Right ovarian lesions: 1. Physiological cysts: are cysts associated with ovarian ovulation, which may appear or disappear with cycle changes, most commonly ovarian follicular cysts and luteal cysts. Physiological cysts usually do not require special treatment and can be considered for observation for 1-3 months due to their association with the ovulatory cycle. 2. Ovarian tumors: They are divided into benign and malignant tumors, and most benign tumors present as cystic masses. If the echogenicity in vivo is fine light dot echo, it may be endometriotic cyst, i.e. chocolate cyst. If the cystic mass contains more separation, it may be plasmacytic cystadenoma or mucinous cystadenoma, and also includes right ovarian teratoma as well as right ovarian cancer. The fluid in the fallopian tube further wraps around the ovary and turns into a tubo-ovarian cyst, which is a more serious inflammatory mass in the pelvis. In addition, an ectopic pregnancy in the right fallopian tube may also result in a cystic mass in the right adnexal area. Therefore, if a cystic mass of <5 cm in the right adnexal region is found and there is no parenchymal component or papillary nodules, it can be considered for observation first. Physiological cysts can usually disappear within 3 months and can be observed with follow-up. Oral contraceptive pills or Chinese medicine treatment, such as levonorgestrel or adamantine oral solution, can also be considered according to the actual situation. If it is an ovarian tumor, the benignity and malignancy of the cyst should be determined by combining serum tumor markers and pelvic CT. Benign cysts require surgical treatment, such as laparoscopic surgery. If a malignant tumor is highly suspected, open surgery is required.