CNS tumor
CNS cysts
Choroid plexus cyst

Topic Completed: 1 February 2012

Revised: 31 December 2018, last major update February 2012

Copyright: (c) 2002-2018,, Inc.

PubMed Search: Choroid plexus cyst [title]

Eman Abdelzaher, M.D., Ph.D.
Page views in 2018: 958
Page views in 2019 to date: 721
Cite this page: Abdelzaher E. Choroid plexus cyst. website. Accessed October 21st, 2019.
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

Images hosted on other servers:

MR shows small cyst

MRI shows cyst of third ventricle

Case reports
Clinical images

Images hosted on other servers:

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
Microscopic (histologic) images

Images hosted on other servers:

Choroid plexus cyst

Positive stains
Negative stains
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