Which fertility-sparing method involves preserving ovarian tissue rather than mature oocytes?

Which fertility-sparing method involves preserving ovarian tissue rather than mature oocytes?

• A. Oocyte cryopreservation
• B. Ovarian tissue cryopreservation
• C. Embryo cryopreservation
• D. Donor egg donation

Answer: (B)

Preserving ovarian tissue preserves the ovarian cortex with primordial follicles, rather than freezing mature eggs. This approach aims to keep the patient’s own fertility by removing a slice of ovarian tissue, freezing it, and later reimplanting it or using laboratory techniques to mature follicles from the preserved tissue. It’s particularly useful when there isn’t time for ovarian stimulation or for someone who is prepubertal, since it doesn’t require mature oocytes at the time of preservation. In contrast, freezing mature eggs requires stimulating the ovaries to produce eggs and then freezing those eggs; freezing embryos involves fertilizing eggs before freezing; and donor egg donation uses eggs from another person. Therefore, preserving ovarian tissue is the fertility-sparing method that involves tissue rather than mature oocytes.

Preserving ovarian tissue preserves the ovarian cortex with primordial follicles, rather than freezing mature eggs. This approach aims to keep the patient’s own fertility by removing a slice of ovarian tissue, freezing it, and later reimplanting it or using laboratory techniques to mature follicles from the preserved tissue. It’s particularly useful when there isn’t time for ovarian stimulation or for someone who is prepubertal, since it doesn’t require mature oocytes at the time of preservation. In contrast, freezing mature eggs requires stimulating the ovaries to produce eggs and then freezing those eggs; freezing embryos involves fertilizing eggs before freezing; and donor egg donation uses eggs from another person. Therefore, preserving ovarian tissue is the fertility-sparing method that involves tissue rather than mature oocytes.