Table 2 Sonographic criteria for eccentric pregnancy

Eccentric Pregnancy Ultrasound Criteria:

1. Implantation of the embryo in the lateral angle of the uterine, cavity, just medial to the uterotubal junction [8].

2. ≤ 1 cm of myometrial thickness surrounding the gestational sac [22].

3. Presence of completely circumferential endometrium surrounding the gestation, and therefore diagnostic of intrauterine gestation. “Surrounding endometrium” or “double sac sign” [22]

4. Lack of an “interstitial line sign” or extension of endometrium to the gestational sac edge [21].