Teratoma is a type of ovarian cyst, and whether surgery is necessary depends on the specific conditions found during examination. Teratomas are related to congenital factors. It has been found that medication is ineffective in treating teratomas. If the teratoma is relatively small, regular check-ups can be sufficient. However, if it is growing rapidly, there is a possibility of malignant transformation, or if it is large enough to cause abdominal pain due to torsion, then surgery must be prepared for immediately. Ultimately, the nature of the teratoma is determined through pathological examination.