Chorionic Bump as a Marker for Early Pregnancy Loss: A Retrospective Cohort Study

A chorionic bump (CB) is an uncommon finding in early first-trimester obstetric ultrasounds. The current study estimates the prevalence of CB and investigates its association with early pregnancy loss. We included 2589 pregnancies over a 3-year period. The overall prevalence of CB was 1.1% (28/2589). There were no differences in baseline demographics, obstetric measurements, or mode of conception in patients with or without CB. The presence of CB was not associated with statistically significant odds of early pregnancy loss in the current cohort (unadjusted OR 1.4; 95% CI 0.5-3.7; adjusted OR 1.3; 95% CI 0.4-3.6).