A case of identical twins following in vitro fertilization and embryo transfer (IVF-ET) is described. Two embryos were transferred, but it is apparent that only one implanted and subsequently divided in the early implantation phase to produce identical male twins within a monochorionic, diamniotic placental and membrane configuration. Additional marker studies provide an overall probability of < 0.001 for dizygosity. There is unlikely to be any relationship between this event and the technique of IVF-ET.
Yovich, J. L., Stanger, J. D., Grauaug, A., Barter, R. A., Lunay, G., Dawkins, R. L., & Mulcahy, M. T. (1984). Monozygotic twins from in vitro fertilization. Fertility and Sterility, 41(6), 833–837. https://doi.org/10.1016/S0015-0282(16)47894-5