Fetal sex discordance in a monochorionic twin pregnancy following intracytoplasmic sperm injection: A case report of chimerism and review of the literature.

A 39-year-old woman who became pregnant with twins after an intracytoplasmic sperm injection was referred at the ninth gestational week to determine chorionicity. Ultrasonographic examination showed a monochorionic diamniotic twin pregnancy. First trimester nuchal translucency measurements of the fetuses were 1.