The process of freezing ovarian tissue to save for future infertility treatment. Part or all of an ovary is removed, and the tissue that contains the eggs is cut into thin slices and frozen. The tissue may later be thawed and placed back into the woman’s body, usually on the remaining ovary. Ovarian tissue freezing is a type of fertility preservation. It may be useful for women who want to have children after having treatment that may cause infertility, such as certain cancer treatments. Also called ovarian tissue banking and ovarian tissue cryopreservation.