There are some more nervous patients who, as soon as they are found to have a chocolate cyst, doctor, will this cyst become cancerous? We will explain to this group of patients: in general, the cancer rate of chocolate cysts is not high, only 1%, which means that 1 out of 100 patients may have cancer. Under what circumstances is cancer likely to occur? There are some high-risk factors and high-risk groups, such as: 1) older than 50 years old, with a longer disease duration, maybe 8-9 years before and after the discovery of chocolate cyst, which are all high-risk factors that may cause cancer; 2) more obese patients; 3) long-term oral treatment with special drugs. All of them may have this condition. We will make special examinations according to different cases, if the disease is long and old, to help us determine whether she has the possibility of cancer or not.