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

Objective: To report a case of conjoined twins conceived through assisted reproduction after intracytoplasmic sperm injection (ICSI) and the transfer of three eight-cell embryos on day 3.

Design: Case report.

Setting: Assisted reproduction unit of a private hospital.

Transfer at the blastocyst stage of embryos derived from testicular round spermatid injection.

Background: Intracytoplasmic injection of testicular round spermatids has been suggested as a salvage treatment in couples when testicular sperm extraction does not yield any mature sperm. However, the success of the procedure is debatable, and controversy surrounds issues such as the presence and (if present) identification of spermatids in testicular tissue. Progression rate to the blastocyst stage of spermatid-derived embryos appears to be low.