Pregnancy from grafted ovarian tissue a world first
The woman asked for the tissue to be frozen seven years ago, when her second ovary was removed as a result of cancer.
Now she is 25 weeks pregnant with twin girls, thanks to work carried out by fertility preservation scientists at Melbourne IVF and The Royal Women's Hospital.
"It's two girls. We're pretty excited. A bit freaked out," said the mum-to-be, identified as Vali.
She said she was lucky her doctor offered her the opportunity to freeze tissue.
She did not fully understand the implications at the time but hoped it would one day allow her to have a baby.
"It's almost science fiction... it's phenomenal," said dad-to-be Dean.
Doctors around the world have previously achieved 29 births by grafting preserved ovarian tissue back into the pelvis, a procedure known as orthotopic transplantation.
However, this is the first sustained pregnancy as a result of heterotopic transplantation, where ovarian fragments