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Objective: The aim of the study was to discuss the value of ultrasound examination in the diagnosis of fetal gastric teratoma.Methods: We retrospectively analyzed 2 cases with fetal gastric teratoma in our hospital(Department of Gynecology and Obstetrics,Sun Yat-sen Memorial Hospital,Sun Yat-sen University,Guangzhou,China).It involved clinical, ultrasonic,X-ray,CT and MRI,biochemical,pathological,karyotype and immunohistochemical data.Results: There both were hybrid echo masses in the abdominal of the fetus with the sonography and the ultrasound features which mostly like the teratomas.Two cases were dead after induced abortion.The pathological results of the mass were gastric immature teratoma in one,and stomach mature teratoma in another.Conclusion: Fetal gastric teratoma is rarely seen and easily be misdiagnosed in clinic.The diagnosis depends finally on pathological examination.Ultrasound scan as the easy and direct method is helpful to clew the diagnosis of fetal gastric teratoma.