Editing Choroid plexus cyst (section)

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| name            = Choroid plexus cyst
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| image           = Ultrasound Scan ND 1231102308 1028500.png
| caption         = Prenatal ultrasound showing a well defined hypoechoic lesion corresponding to a choroid plexus cyst
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| field           = [[Neurosurgery]]
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'''Choroid plexus cysts''' ('''CPCs''') are [[cyst]]s that occur within [[choroid plexus]] of the brain. They are the most common type of intraventricular cyst,<ref name="Pappalado">{{cite journal |last1=Pappalardo |first1=Elisa Maria |last2=Militello |first2=Mariapia |last3=Rapisarda |first3=Giusi |last4=Imbruglia |first4=Laura |last5=Recupero |first5=Stefania |last6=Ermito |first6=Santina |last7=Dinatale |first7=Angela |last8=Carrara |first8=Sabina |last9=Cavaliere |first9=Alessandro |title=Fetal intracranial cysts: prenatal diagnosis and outcome |journal=Journal of Prenatal Medicine |date=2009 |volume=3 |issue=2 |pages=28–30 |pmid=22439038 |pmc=3279101 }}</ref> occurring in 1% of all pregnancies.<ref name="pmid19098176">{{cite journal |vauthors=Naeini RM, Yoo JH, Hunter JV |title=Spectrum of choroid plexus lesions in children |journal=AJR. American Journal of Roentgenology |volume=192 |issue=1 |pages=32–40 |date=January 2009 |pmid=19098176 |doi=10.2214/ajr.08.1128 |url=}}</ref>

It is believed that many adults have one or more tiny CPCs.<ref name="pmid15832013">{{cite journal |last1=Jeon |first1=Jin Ho |last2=Lee |first2=Sang Weon |last3=Ko |first3=Jun Kyeong |last4=Choi |first4=Byeong Gwan |last5=Cha |first5=Seung Heon |last6=Song |first6=Geun Seong |last7=Choi |first7=Chang Hwa |title=Neuroendoscopic Removal of Large Choroid Plexus Cyst: A Case Report |journal=Journal of Korean Medical Science |date=2005 |volume=20 |issue=2 |pages=335–9 |doi=10.3346/jkms.2005.20.2.335 |pmid=15832013 |pmc=2808618 }}</ref> 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.<ref>{{cite journal |last1=Benacerraf |first1=Beryl R. |last2=Laboda |first2=Lane A. |title=Cyst of the fetal choroid plexus: A normal variant? |journal=American Journal of Obstetrics and Gynecology |date=February 1989 |volume=160 |issue=2 |pages=319–321 |doi=10.1016/0002-9378(89)90434-1 |pmid=2644832 |s2cid=21224368 }}</ref>

CPCs are a rare cause of intermittent [[hydrocephalus]]. This is caused by a blockage of foramina within the ventricular drainage system of the [[central nervous system]] (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.<ref name="pmid9297582">{{cite journal |last1=Büttner |first1=A. |last2=Winkler |first2=P. A. |last3=Eisenmenger |first3=W. |last4=Weis |first4=S. |s2cid=41162320 |title=Colloid cysts of the third ventricle with fatal outcome: a report of two cases and review of the literature |journal=International Journal of Legal Medicine |date=10 August 1997 |volume=110 |issue=5 |pages=260–266 |doi=10.1007/s004140050082 |pmid=9297582 }}</ref>