If the malignant cystadenoma of ovary is in early stage and treated timely, the survival rate is still relatively high; if it is in middle or late stage, then it may be more difficult to cure. If the malignant cystadenoma of ovary is in early stage, the cancer cells have not metastasized and only confined to the ovary, the ovary can be removed by radical surgery and the surrounding lymph nodes can be cleared. At this time, the surgical effect is better, and the probability of recurrence and metastasis of malignant tumor is lower, so the chance of survival is relatively higher. If the malignant cystadenoma of the ovary has reached the middle or late stage, the malignant tumor has invaded a larger range, and may have metastasized to other organs or tissues other than the ovary, thus losing the opportunity to achieve radical treatment through surgery. Generally speaking, it is more difficult to realize the effect of cure, and it is necessary to use chemotherapy, radiotherapy or other targeted therapy. Female patients are recommended to have regular medical checkups for early detection and timely treatment of malignant tumors. Ovarian malignant tumors need to be under the guidance of doctors, according to the patient’s specific condition to determine the prognosis.