A teratoma with mixed echoes is not necessarily benign. Teratoma is a common type of ovarian germ cell tumor, derived from germ cells, and is divided into benign teratoma and malignant teratoma. The mixed echoes of teratoma indicate that the internal composition of the tumor is not uniform, while both benign and malignant tumors can present mixed echoes, which can not be used as a criterion for judgment. Benign teratomas are usually cystic in shape and contain a variety of components, such as hair, skin, nerve tissue, etc. Abnormal calcifications, such as teeth or abnormal bones, can be seen on X-ray. Malignant teratomas are often solid and often associated with poor differentiation. It is recommended that the patient receive appropriate treatment under the guidance of a physician, and the tumor should be removed and sent for pathological examination to clarify the nature of the tumor. Therefore, it is not possible to determine the nature of the teratoma just by its echogenicity. It is recommended that the patient go to the hospital for diagnosis and treatment.