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A successful pregnancy from zygotes cryopreserved for >9 years: case report.

PURPOSE
To evaluate the longest interval that embryos can remain frozen and still result in a viable pregnancy after thaw and transfer.


METHODS
Case report.


RESULTS
A 42-year-old woman conceived and successfully completed the first trimester after transfer of frozen donated embryos from a 32-year-old woman whose eggs had been cryopreserved for over nine years.


CONCLUSIONS
Patients can now be informed that there is anecdotal evidence that embryos can survive and result in successful pregnancies even after nine years of cryopreservation. This information may affect legislative decisions in requiring destruction of these stored embryos.