Teratomas are categorized into mature teratomas, which are benign, and immature teratomas, which are malignant. The consequences of untreated malignant teratoma, just like untreated other malignant tumors, will definitely lead to the death of the patient. For benign teratomas, since teratomas can occur in different locations in the body, the consequences vary if left untreated. Benign teratomas can occur in the brain, stomach, testes, female ovaries and other areas. Teratomas in the brain, if left untreated and allowed to grow, will eventually compress brain tissue, leading to brain hernia, neurological dysfunction, etc., and can be fatal in severe cases. Teratomas in the stomach can cause abdominal pain, bloating, indigestion and other digestive symptoms, and in severe cases, can lead to gastrointestinal hemorrhage. Testicular teratomas are most common in boys and can lead to infertility, physical developmental disorders, mental retardation and other complications. Ovarian teratomas are asymptomatic at first, but can also lead to infertility and menstrual irregularities when they grow to a certain size. In severe cases, teratoma tip torsion can occur, causing severe abdominal pain, rupture bleeding can lead to hemorrhagic shock, and severe cases can be fatal. In fact, benign teratoma surgical excision effect is good, no recurrence, should be treated as early as possible. Malignant teratoma is not to mention, early detection and early treatment, the effect is also very good.