Ectopic pregnancies are rare and represent about 2% of all pregnancies. Unilateral ectopic twin pregnancy is even rarer as it represents only 0.5% of all ectopic pregnancies, with an estimated incidence of 1 in 20 000. It shares the same risk factors as ectopic pregnancies in general (smoking, pelvic infection, history of EP, maternal age, uses of assisted reproduction techniques, etc.). The most common site of implantation is the fallopian tube. Clinically, it presents with the classic triad of symptoms of ectopic pregnancy, namely pelvic pain, metrorrhagia and the notion of amenorrhea. The usual strategy for diagnosis of ectopic pregnancy, including ectopic twin pregnancy, relies mainly on quantitative beta-HCG level and endo-vaginal ultrasound. We report a case of ectopic twin pregnancy, in a 24-year-old primiparous patient with a history of upper genital infection 2 years ago and whose treatment was a left salpingectomy.