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Table 2 Sonographic criteria for eccentric pregnancy

From: Differentiating pregnancies near the uterotubal junction (angular, cornual, and interstitial): a review and recommendations

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].