Ectopic pregnancy (EP) is a challenging obstetrical entity in terms of diagnosis both for the clinican and the radiologist. It is still the leading cause of pregnancyrelated morbidity and mortality and fallopian tube is the commonest site of ectopic pregnancy. Incidence of rare forms of EP such as heterotopic and C-section scar EP is increasing because of the high rate of C-section surgeries and increased use of in vitro fertilization. Ultrasonography, combined with serum β-hCG level, is still the most effective radiologic modality in diagnosing EP. Ultrasound and color flow Doppler features of fallopian tube ectopic pregnancy and other rare types of ectopic pregnancies are reviewed and addressed in this article.