This is a 41-year-old-woman with an omphalocele diagnosed at 13 weeks and 3 days. A chorionic villus sampling was performed and the karyotype revealed a trisomy 18.

Right image: Single umbilical artery. Left image: Note the omphalocele and the umbilical cord cyst.

Axial images showing the round mass at the level of the umbilical cord.