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Choroid plexus cyst
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<p>Choroid plexus cysts (CPCs) are <a href="/facts/Cyst/N1n2ogU9">cysts</a> that occur within <a href="/facts/Choroid_plexus/glqWkmkG">choroid plexus</a> of the brain. They are the most common type of intraventricular cyst, occurring in 1% of all pregnancies. </p><p>It is believed that many adults have one or more tiny CPCs. The fetal brain may create these cysts as a normal part of development. They are temporary and usually are gone by the 32nd week of pregnancy. </p><p>CPCs are a rare cause of intermittent <a href="/facts/Hydrocephalus/HF9jQqTq">hydrocephalus</a>. This is caused by a blockage of foramina within the ventricular drainage system of the <a href="/facts/Central_nervous_system/k8I6To97">central nervous system</a> (CNS), which can lead to expansion of the ventricles, compressing the brain (the cranial cavity cannot expand to accommodate the increase in fluid volume) and possibly causing damage. </p>