Anencephaly in a monochorionic monoamniotic twin pregnancy

Case contributed by Alexandra Stanislavsky


Review of pregnancy. 14 weeks and 6 days gestational age.

Patient Data

Age: 20 years
Gender: Female

Monochorionic monoamniotic twin pregnancy (note entangled umbilical cords). 

Twin 1 with anencephaly; no other morphologic abnormality is seen.

Twin 2 is morphologically normal with biometry concordant with dates.

Posterior placenta, closed cervix.

Case Discussion

Monochorionic, monoamniotic twin pregnancy. One twin with anencephaly and the other twin normal. 

Laser cord ligation was offered to the patient at the time of examination. Pregnancy outcome, however, is not known.

Twin pregnancy is associated with a higher rate of non-syndromic anomalies than singleton pregnancy, and this is particularly notable in monochorionic twins. 

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.