Why Do Choroid Plexus Cyst Form?

A choroid plexus cyst happens when a small amount of the cerebrospinal fluid gets trapped in the layer of cells as your baby's brain grows and develops. The cysts go away on their own during pregnancy, usually by week 32. Choroid plexus cysts can happen in any pregnancy.

How does choroid plexus cyst happen?

Choroid plexus cysts are often found during an ultrasound. They occur when a small bubble of fluid breaks away as the choroid plexus forms. The cysts aren't considered to be abnormal. Most choroid plexus cysts clear up without requiring further medical intervention.

Does a choroid plexus cyst mean Down syndrome?

Choroid plexus cysts may be detected in the fetal choroid plexus on routine second trimester ultrasound scanning. The presence of these cysts is associated with trisomy 18 (Edward syndrome) in 3.47% of cases and with trisomy 21 (Down syndrome) in 0.46% of cases.