Pathologic examination can confirm the benign or malignant nature of cystadenoma. Cystadenomas are tumors that can secrete and store secretion fluid in cystic nature, and the contents of cystadenomas can be of plasma, mucus, or colloid nature, and can occur in ovary, pancreas, liver, kidney, breast, and even prostate gland. To determine the nature of cystadenoma, it is mainly based on tumor biopsy and pathological examination, through the examination of pathological results, to determine the nature of the tumor is benign or malignant, as well as to help determine which specific type of cystadenoma belongs to, such as cystic adenocarcinoma, papillary cystadenoma, papillary cystadenoma, and so on, and then guide the treatment plan.