Chorionic bump is a rare medical condition defined as an irregular, convex bulge or protrusion from the choriodecidual surface into the gestational sac.[1][2] It is medically defined as a separate entity from a chorionic hematoma.[3]
Identification of a chorionic bump in early first trimester pregnancy represents a significant risk factor for pregnancy loss, given a live birth rate of less than 50%.[4] The incidence rate for chorionic bump is estimated to be between 1.5 and 7 per 1000 pregnancies.[3]
Existing literature suggests that chorionic bump causes first trimester pregnancy loss and doubles the miscarriage rate as compared to having no risk factors.[4]
