IMPORTANT: We currently have a number of bugs related to image cropping and are actively trying to resolve them. In the meantime, we have disabled cropping. Apologies for any inconvenience. Stay informed: radiopaedia.org/chat

Chorionic bump

Case contributed by Matt A. Morgan
Diagnosis almost certain

Presentation

Patient presented to the ED with abdominal cramps. No vaginal bleeding. Fetal age by crown-rump length = 7 weeks 2 days.

Patient Data

Age: 30-35 years
Gender: Female
ultrasound

At the point of attachment of the umbilical cord with the chorion, there is a round, well-marginated, hypoechoic outpouching that extends into the choriodecidual space.

Case Discussion

A "chorionic bump" is an uncommon finding in the first trimester.  Its etiology is uncertain, but it may represent a small hematoma. A failed twin pregnancy has also been suggested as an etiology.

It is unclear if this finding results in developmental problems with the fetus or with complications of the pregnancy. Close interval follow up is prudent. The association with a chorionic bump has an almost double risk of miscarriages.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.