Ovarian teratoma is one of the most common benign tumors in gynecology and is a common cause of gynecologic surgery. Teratomas can occur not only in the ovaries of women, but also in the testes, retroperitoneum, mediastinum, head and neck, and sacrococcygeal region of the fetus in men. The ovary is a common site for teratomas. Ovarian teratoma is a common site in women, but it is usually discovered inadvertently during a physical examination in adulthood, and is usually diagnosed by ultrasound, which can be used to make a general diagnosis. In some patients, a pre-operative x-ray can even reveal the presence of teeth in the lower abdomen. Teratomas are usually asymptomatic, but in some cases they may become large enough to twist (like a watermelon turning several times) and cause acute abdominal pain. Rarely, teratomas may also cause neurological encephalitis. Some patients may have elevated tumor markers such as aFP and CA125 on preoperative testing. As a rule, teratomas found require surgical management, and nowadays, laparoscopic surgery has become the mainstream. Laparoscopic surgery is fast in recovery, less painful, and much less invasive than the previous traditional open surgery. Laparoscopic surgery usually involves making 3-4 incisions of 5mm or 10mm in the abdominal wall, but now there is also a single-hole laparoscopic technique that leaves no scars on the abdominal wall except for the belly button, which has a lot of appeal especially for young women. Usually, Dr. Gong personally prefers to observe ovarian teratoma below 3cm, and the chance of reversal is not high for those below 3cm, but for those above 3cm, elective surgery is recommended. Some patients may ask if they can get pregnant with the tumor and then have it treated together with a cesarean section. This is not impossible, but it is preferred to be treated before pregnancy to avoid accidents during pregnancy due to torsion and difficult treatment during pregnancy. The vast majority of ovarian teratomas are mature, or benign, and a few have immature or malignant potential, depending mainly on postoperative pathology to determine. Regular postoperative follow-up is required. Individual patients may have recurrence in the same or opposite ovary, and surgical treatment is still advisable after recurrence.