Conjoined twins after intracytoplasmic sperm injection and transfer of day-3 embryos

Conjoined twins conceived through assisted reproduction are extremely rare. This case, which occurred after transfer of cleavage-stage embryos, suggests that ovulation induction, ICSI, and assisted hatching may also play roles in addition to other factors commonly proposed to be responsible for conjoined twining, such as in vitro culture condition, culture time, and blastocyst-stage transfer.