Adnexal cysts 37 x 28mm do not necessarily shrink after menstruation. Adnexal cyst 37×28mm, if it is a cyst formed by oversized follicles, it may shrink to a certain extent or be eliminated directly after menstruation. If it is a pathological adnexal cyst, such as epithelial tumor, etc., which may be related to endocrine disorders, inflammation and infection, drug factors, etc., this kind of cysts will not shrink with the clean menstruation, and there may be a tendency to increase in size with the prolongation of time, and need to comply with the instructions of the doctor to actively treat. Therefore, adnexal cysts 37×28mm should be rechecked 3-7 days after menstruation, and according to the result of the recheck, the cause of the disease should be clarified and targeted treatment should be carried out under the guidance of professional doctors.