Sex-discordant twins despite single embryo transfer: a report of two cases.

We report two extremely rare cases in which the patients delivered male and female infants that were dizygotic twins (DZT) despite single embryo transfer. : The patient was a 35-year-old woman with a 9-year history of unexplained infertility. In an oocyte retrieval cycle, one blastocyst was transferred; at 26 weeks of gestation, she delivered a 704-g female infant and a 420-g male infant by cesarean section.

A successful pregnancy outcome using frozen testicular sperm from a chimeric infertile male with a 46, XX/46, XY karyotype: case report.

Background: We report a very rare case of the successful delivery of a healthy infant fathered by an infertile chimera.

Methods: ICSI was performed using frozen sperm. The karyotypes of peripheral lymphocytes were examined with a G-banding stain.