Interstitial and Caesarean-scar pregnancy

Interstitial (cornual) pregnancy implants in the part of the fallopian tube that runs through the muscular wall of the uterus, while a Caesarean-scar pregnancy implants within the scar tissue from a previous Caesarean section. Both are uncommon forms of ectopic pregnancy, but both are considered higher risk than a typical tubal ectopic pregnancy because they can grow for longer before causing symptoms and can cause serious bleeding if they progress. Diagnosis is usually made by ultrasound, sometimes needing a specialist scan or additional imaging, and management is individualised, involving medication, surgery, or a combination, depending on how early the pregnancy is found. As with any ectopic pregnancy, contact your fertility clinic urgently, or attend the nearest hospital emergency department, if you have pelvic pain or bleeding in early pregnancy after a previous Caesarean section or if this diagnosis has been raised.

Also known as: cornual pregnancy, caesarean scar pregnancy, c-section scar pregnancy

Last reviewed: 9 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.