The medical explanation of immature teratoma is a kind of malignant tumor disease with unknown etiology mainly originated from germ cells, according to the different symptomatic manifestations of different parts of the tumor growth, the main treatments include surgery, radiotherapy and so on, the prognosis is good in early stage, and the survival period is short and the prognosis is poor in late stage. Immature teratoma occurs in ovary, testis, mediastinum, retroperitoneum and other parts of the body. Tumors occurring in ovary mainly manifest abdominal distension, ovarian mass, etc., immature teratoma of testis manifests as a painless mass of testis, and occurs in mediastinum which can manifest symptoms such as chest tightness, breathlessness and chest pain, and occurs in retroperitoneum which manifests abdominal distension, constipation and so on. Early-stage patients can be radical surgery to remove the tumor, some patients can be cured, five-year survival rate of about 80%, late-stage patients can only be given chemotherapy, radiotherapy and other comprehensive treatment measures, the majority of patients can not be cured, the survival period is short, the prognosis is poor.