Ovarian teratoma belongs to a type of germ cell tumor. Ovarian teratomas can be classified into mature teratomas and immature teratomas. Mature teratoma, also known as dermoid cyst, is mostly a benign tumor. Within the cyst, components such as sebum, hair, teeth, and bone can be found. Additionally, mature teratomas have a malignant transformation risk of 2%-4% and are commonly seen in postmenopausal women. On the other hand, immature teratomas are malignant tumors, accounting for 1%-3% of ovarian teratomas and more commonly found in younger patients, with the average age ranging from 11 to 19 years old. Therefore, timely surgical treatment is necessary once an ovarian teratoma is detected.