Successful pregnancy and delivery from frozen-thawed embryos after intracytoplasmic sperm injection using round-headed spermatozoa and assisted oocyte activation in a globozoospermic patient with mosaic Down syndrome.

To describe a successful pregnancy and delivery from frozen-thawed embryos after intracytoplasmic sperm injection (ICSI) and assisted oocyte activation in a globozoospermic patient with mosaic Down syndrome. Controlled clinical study. IVF Laboratory, PL Infertility Clinic, Seoul, Korea. A couple with infertility resulting from globozoospermia with mosaic Down syndrome: 47,XY,+21[7]/46,XY[33]. Semen analysis, karyotyping, ICSI, assisted oocyte activation, assisted hatching, and frozen-thawed ET. Fertilization rate, implantation, pregnancy, and delivery. Thirty-eight oocytes were aspirated, and round-headed spermatozoa were injected into 35 oocytes in metaphase II. Assisted oocyte activation with calcium ionophore A23187 after ICSI resulted in a high fertilization rate (21 of 35, 60%; 2 pronuclei in 18 of 21; 3 pronuclei in 3 of 21) and good embryo development. At 3 days after ICSI, 5 embryos of good quality were surgically transferred to the endometrium after assisted hatching, but no pregnancy occurred. After 2 months, the surgical transfer of 4 frozen-thawed embryos after assisted hatching led to an ongoing pregnancy. A female infant weighing 3,000 g was delivered at 38 weeks of gestation by cesarean section. We report the first successful pregnancy and delivery from frozen-thawed embryos after ICSI and assisted oocyte activation in a globozoospermic patient with mosaic Down syndrome.