Choroid plexus cysts are fluid-filled spaces in the choroid plexus, similar to blisters or bubbles. The choroid plexus is an area of the brain that makes cerebrospinal fluid.
Choroid plexus cysts are not tumors or cancer, and they will disappear on their own usually between 24 to 26 weeks of pregnancy. Choroid plexus cysts, in and of themselves, are NOT a problem and do not interfere with brain function. However, there is a slight association between the presence of choroid plexus cysts and underlying chromosome problems such as Down syndrome. If a choroid plexus cysts is seen on your ultrasound, you should discuss this finding and recommended follow-up testing with your healthcare provider.