Chorionic Bumps: A Potential Pitfall in Early Pregnancy Ultrasound

Claire Lamb, Stockport NHS Foundation Trust


A Chorionic Bump (CB) is an irregular, convex bulge extending from the choriodecidual surface into the gestation sac and is speculated to represent a haematoma. It is most commonly seen within the first trimester and can differ greatly in size and appearance, occasionally mimicking an embryo when small. The reported incidence of CB ranges between 1.5 - 7 per 1000 pregnancies and is often found incidentally.1 Research is currently very limited and the significance of the finding in relation to pregnancy outcome is unclear. This poster demonstrates a case of CB within the first trimester and its varying appearance over time.

View the poster here