Teratoma is divided into mature teratoma (benign teratoma) and immature teratoma (malignant teratoma), benign teratoma is the most common, but malignant tendency increases with age, so timely detection and treatment can reduce the incidence of malignant teratoma. The clinical symptoms and auxiliary examination can be used to determine whether malignant teratoma is present. 1.judgment of malignant teratoma 1.judgment according to clinical manifestations (1) abdominal pain, abdominal distension; (2) pelvic abdominal mass; (3) systemic symptoms such as emaciation, anemia and tumor fever may appear in late metastases. (1) Tumor marker measurement: tumor markers CA125, CA199 and methemoglobin AFP are all elevated to different degrees, with methemoglobin AFP being more obvious; (2) CT examination: the boundary of the mass is clear or unclear, fat and nodular calcification can be found inside, and liquid density shadow can also be found; (3) Ultrasound examination: there are mixed echogenic masses, and the internal density of the masses can be found. (4) Histopathological examination: It is composed of immature histological structures of embryogenesis, mostly neuroglial or neural tube like structures, and often has undifferentiated and increased mitotic malignant pathological manifestations. Treatment of malignant teratoma 1.Surgical treatment: Patients without fertility requirements are recommended to undergo comprehensive staged surgery. For those who are young and wish to preserve their reproductive function, regardless of the early or late stage, surgery to preserve reproductive function is feasible. Patients who are children or adolescent girls may not undergo full-scale staging surgery; 2.