Tubal Ring Sign of Ectopic Pregnancy versus Corpus Luteum Cyst: Best Sonographic and Color Duplex Predictors

Ectopic pregnancy remains a common cause of morbidity and mortality in women of childbearing age and its incidence continues to increase worldwide.1-4 The number of ultrasound examinations performed to exclude potential ectopic pregnancies, to determine the location and type of ectopic pregnancy, and to plan the appropriate therapy has also increased.5 Despite advances in both diagnosis and therapy, the early diagnosis of ectopic pregnancy (EP) continues to be problematic and must be excluded in every woman who has positive pregnancy test and having empty uterus in pelvic U/S, the diagnosis would be more difficult in the absence of the fetal pole (with or without cardiac pulsations) or yolk sac inside the suspected extra uterine gestational sac.6-9