First transplantation of cryopreserved ovarian tissue in Portugal, stored for 10 years: an unexpected indication.

Ovarian tissue cryopreservation represents a valid strategy to preserve ovarian function in patients with a high risk of premature ovarian failure. We present a case of ovarian tissue cryopreservation carried out in an 18-year-old woman after a laparotomy for left adnexal mass with left adnexectomy. Congenital absence of the right ovary was observed during surgery. To preserve fertility, rescue cryopreservation of ovarian tissue was carried out under extreme conditions (without adopting the standard published protocol, not yet available at our centre). Ten years later, transplantation of cryopreserved ovarian tissue was carried out and, shortly after it, restoration of ovarian function was confirmed.