Editing Choroid plexus cyst (section)

==Pathology==
The brain contains pockets or spaces called [[ventricular system|ventricles]] with a spongy layer of cells and blood vessels called the [[choroid plexus]]. This is in the middle of the fetal brain. The choroid plexus has the important function of producing [[cerebrospinal fluid]]. The fluid produced by the cells of the choroid plexus fills the ventricles and then flows around the brain and the spinal cord to provide a cushion of fluid around these structures.{{fact|date=June 2020}}

CPCs can form within this structure and come from fluid trapped within this spongy layer of cells, much like a soap bubble or a blister. CPCs are often called "soft signs" or fetal ultrasound "markers" because some studies have found a weak association between CPCs and fetal chromosome abnormalities.{{fact|date=June 2020}}

Choroid plexus cysts are usually asymptomatic and disappears by 26 to 28 weeks of pregnancy. However, large cysts can cause [[hydrocephalus]].<ref name="pmid19098176"/>