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Table 3 Sonographic criteria for interstitial pregnancy

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

Interstitial Pregnancy Ultrasound Criteria:
1. An empty uterine cavity [20].
2. A chorionic sac identified separately from the lateral edge of the uterine cavity by at least 1 cm [20].
3. A thin, 5 mm myometrial layer surrounding the chorionic sac [20].
4. Presence of an “interstitial line sign” or extension of endometrium to the gestational sac edge [21].