Avoiding misdiagnosing an early intrauterine pregnancy as an ectopic pregnancy

Figure 1 Transvaginal ultrasound image of a gestational sac consistent with an early intrauterine pregnancy.

Figure 2 Transvaginal ultrasound image of a fluid collection within the endometrial cavity, a pseudosac, consistent with an extrauterine pregnancy.

Figure 3 Transvaginal ultrasound image of an intrauterine true gestational sac containing a yolk sac.

Figure 4 Transvaginal ultrasound image of a thickened endometrial echo before identification of what will be an intrauterine pregnancy.

Figure 5 Transvaginal ultrasound image of a thin endometrial echo associated with and ectopic pregnancy.

Figure 6 Non-surgical algorithm for the early diagnosis of ectopic pregnancy utilizing vaginal ultrasound, including endometrial echo thickness, serum human chorionic gonadotrophin and serum progesterone. hCG: Human chorionic gonadotropin; US: Ultrasound; EP: Ectopic pregnancy; IUP: Inverted urothelial papilloma.