Bilateral tubal pregnancies after a single-embryo transfer

Case To present an extremely rare case of bilateral tubal pregnancies following a single- embryo transferin a woman with a 4 year history of infertility prior to seeking assisted reproductive technology. Outcome A pregnancy resulted from the transfer of an embryo that had been thawed from a frozen blastocyst during a hormone replacement cycle. An ultrasound that was performed at 5 weeks and 5 days of gestation revealed a gestational sac, embryo, and heartbeatin the right fallopian tubeand similar signs of a gestational sacin the left fallopian tube. A laparoscopy revealed clear signs of an ectopic pregnancyin the ampullaof the right fallopian tube. Signs of swelling also were seen in the ampullaof the left fallopian tube. As the possibility of bilateral tubal pregnancies could not be ruled out, both fallopian tubeswere removed. Pathological tests revealed chorionic villiand trophoblastsin both the left and right fallopian tubes. Conclusion All previously reported cases of bilateral tubal pregnancies have been a result of multiple ovulations or multiple- embryo transferand no case of bilateral tubal pregnancies after a single- embryo transferhas ever been reported. No genetic testing was performed; thus, it cannot be definitively stated that the divided chorionic villiand trophoblastscame from only one embryo.