CNS tumor


Choroid plexus cyst

Topic Completed: 1 February 2012

Minor changes: 27 July 2020

Copyright: 2002-2021,, Inc.

PubMed Search: Choroid plexus cyst [title]

Eman Abdelzaher, M.D., Ph.D.
Page views in 2020: 1,037
Page views in 2021 to date: 1,077
Cite this page: Abdelzaher E. Choroid plexus cyst. website. Accessed November 29th, 2021.
Definition / general
  • Small cyst of choroid plexus containing CSF
  • May be present throughout ventricular system but usually in glomus of lateral ventricles
Clinical features
  • More prevalent in fetuses with chromosomal abnormalities (trisomy 18, trisomy 21, Aicardi syndrome)
  • Common form affect fetuses in 1% of pregnancies; usually asymptomatic, resolves spontaneously by birth but large cysts can cause hydrocephalus
  • Chromosomal abnormalities, specifically trisomy 18, should be considered if cysts are large ( > 1 cm), bilateral or irregular or if maternal age ≥ 32 years (AJR Am J Roentgenol 2009;192:32)
  • In adults, usually asymptomatic, incidental postmortem finding
Radiology description
  • On CT and MRI, usually show CSF density
Radiology images

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MR shows small cyst

Case reports
Clinical images

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Cyst at foramen of Monro

Microscopic (histologic) description
  • Cyst wall lined by cuboidal to columnar epithelium with occasional cobblestone appearance typical of normal choroid plexus
  • Some are devoid of epithelial lining
Positive stains
Negative stains
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