For teratomas, ovarian tumor excision surgery is generally chosen. If the teratoma is too large, and the remaining ovarian tissue is insufficient, there is no need to preserve the ovary, or if the teratoma has severe torsion causing ovarian tissue necrosis, an oophorectomy is necessary. After the oophorectomy, recurrence on the same side is generally not observed, but there is sometimes a possibility of recurrence on the opposite side, though the likelihood of recurrence is very low. Generally, if one ovary is removed due to a teratoma, the recurrence rate on the opposite side is usually less than 10%. Treatment of teratomas is generally surgical, and if not treated timely, complications such as torsion may occur.