a rare case of bilateral ectopic pregnancy and differential diagnosis of gestational trophoblastic disease

background: bilateral ectopic pregnancy is a rare condition and is divided in two subgroups, primary and secondary, based on history of assisted reproductive technology. case presentation: a 30 year old primigravid woman with history of infertility and ovulation induction presented to a hospital in kashan in year 2013. she had vaginal bleeding, abdominal pain and ultrasound findings suggested early pregnancy. due to high titer of β-hcg, gestational trophoblastic disease was proposed and d8c was done in referral and admission to gyneco-oncology ward in tehran. repeat sonography suggested ectopic pregnancy in left side and repeat β-hcg level showed an increase of 19435 miu/ml. laparotomy findings revealed bilateral ampullary ectopic pregnancy. bilateral salpingostomy followed by one course of methotrexate was prescribed. conclusion: bilateral ectopic gestation should be considered as a rare differential diagnosis for ectopic pregnancy. in this study, bigger size and rupture in left side was observed.