Chorionic bump on first-trimester sonography: not necessarily a poor prognostic indicator for pregnancy

Area of Science:

• Obstetrics and Gynecology
• Fetal Medicine
• Diagnostic Ultrasound

Background:

• A chorionic bump is a bulge from the choriodecidual surface into the gestational sac.
• Its impact on pregnancy outcomes is not fully understood.

Purpose of the Study:

• To determine the live birth rate in pregnancies diagnosed with a chorionic bump during the first trimester.

Main Methods:

• Prospective observational study of pregnant patients aged 18+ with a first-trimester chorionic bump.
• Assessed chorionic bump size, number, and history of infertility or coagulation disorders.
• Primary endpoint was pregnancy outcome.

Main Results:

• 52 pregnancies with a chorionic bump yielded a 65% live birth rate (34/52).
• In otherwise normal pregnancies (n=41), the live birth rate was 83% (34/41).
• Multiple chorionic bumps (4) resulted in 100% demise; size and outcome showed no significant correlation.

Conclusions:

• A chorionic bump diagnosis in the first trimester has a 65% overall live birth rate.
• The prognosis is more favorable (83% live birth rate) in otherwise normal pregnancies.
• A chorionic bump does not necessarily indicate a poor pregnancy prognosis.