Chorionic bump

Chorionic bump is a rare medical condition defined as an irregular, convex bulge or protrusion from the choriodecidual surface into the gestational sac. It is medically defined as a separate entity from a chorionic hematoma.
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%. The incidence rate for chorionic bump is estimated to be between 1.5 and 7 per 1000 pregnancies.

Cause and diagnosis

It is believed that chorionic bump can start as a hematoma in the intervillous space. Additionally, Infertility treatments may be associated with increased likelihood of chorionic bump.

Prognosis and treatment

Existing literature suggests that chorionic bump causes first trimester pregnancy loss and doubles the miscarriage rate as compared to having no risk factors.