Table 2.

Main ultrasonographic differences between angular and interstitial pregnancy

	Angular	Interstitial
Classification	Eccentric	Ectopic
Position to the round ligament	Medial	Lateral
Position to the endometrial cavity	Inside	Outside
Position to the utero-tubal junction	Medial	Lateral
Myometrial mantle thickness	> 5 mm	≤ 5 mm
Endometrium-myometrium junctional zone	Presence of gestational sac	Intact
Distance between lateral uterine border and gestational sac	< 1 cm	> 1 cm
Surrounding structure	Endometrium	Myometrium
Interstitial line sign	No	Yes