Chorionic bump is a rare abnormal condition of the gestational sac seen in the first trimester of pregnancies, extending from the choriodecidual surface to the gestational sac. We report the sonographic and histopathologic findings in a case involving three "chorionic bumps" extending from the choriodecidual surface to the gestational sac. Chorionic bump can be associated with a poor prognosis for the pregnancy. Therefore, cases with chorionic bumps must be followed with serial ultrasound examinations throughout the first trimester.
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Introduction: A chorionic bump is an increasingly recognized ultrasound finding in first-trimester scans, which has been associated with early pregnancy loss. In ongoing second-trimester pregnancies, however, chorionic bumps usually resolve over time with no deleterious effect on the fetus. In this report, we describe the incidental ultrasound detection of a chorionic bump in early pregnancy and its progression to a subamniotic hematoma in the second trimester of pregnancy that persisted as such until delivery.
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