Presentation
Abdominal pain.
Patient Data
Transvaginal ultrasound images of the uterus demonstrate a cystic, rounded structure with an echogenic peripheral rim in the region of the uterine cornu.
This structure refers to the gestational sac because of the positive BHCG, empty endometrial cavity, decidual reaction, and no adnexal lesion on either side.
An echogenic line extends from the endometrium to the gestational sac (interstitial line sign).
The myometrial thickness around the gestational sac is 2.5 mm.
The mean sac diameter is 8 mm.
No fetal pole and no yolk sac are seen.
Case Discussion
This case demonstrates an interstitial ectopic pregnancy based on the following findings:
positive BHCG
empty endometrial cavity
myometrial thickness around the gestational sac < 5 mm
no adnexal lesion on either side.
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