Cornual ectopic pregnancy

Last revised by Bahman Rasuli on 23 Jul 2020

Cornual ectopic pregnancies are rare and represent a gestational sac within the cornua of a bicornuate or septate uterus. 

Although sometimes interchangeably used with interstitial pregnancy, cornual pregnancy specifically refers to the presence of a gestational sac within a rudimentary uterine horn, a unicornuate uterus, cornua of a bicornuate uterus or septate uterus. 

They are reported to represent less than 1% of all ectopic pregnancies 1.

  • interstitial line sign
  • eccentric position of sac: gestational sac is surrounded by a thin rim (<5 mm) of myometrium and is more than 1 cm from the lateral wall of the endometrial cavity 

Rupture of a cornual pregnancy can cause a catastrophic intra-abdominal bleed.

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