Cavum vergae

The cavum vergae (CV), along with the cavum septum pellucidum (CSP) is a persistence of the embryological fluid-filled space between the leaflets of the septum pellucidum and is a common anatomical variant. The CV is sometimes referred to as the 6th ventricle 3

Gross anatomy

The CV is the posterior extension of the CSP, posterior to the anterior columns of the fornix, lying inferior to the splenium of the corpus callosum, but it may exist independently 1-3

Relations 3
  • anteriorly: fornix
  • posteriorly: splenium of the corpus callosum
  • superiorly: body of the corpus callosum
  • inferiorly: transverse fornix


The CV and CSP usually close in the 6th week in utero but may persist in 30% of term infants and 15% of adults 3. During development, these spaces obliterate postero-anteriorly: the CV followed by the CSP. Because of this ordered obliteration, a CSP almost always accompanies a CV may not always occur in the same sequence 1-2.

Differential diagnosis

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Article Information

rID: 1067
Section: Anatomy
Synonyms or Alternate Spellings:
  • 6th ventricle
  • Sixth ventricle
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    Difference betwee...
    Figure 1: CSP and CV
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    Case 1: CSP and CV (MRI)
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    Case 2: CV and CSP (CT)
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    Case 3: CV and CSP
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    Case 5: CSP and CV (multiplanar CT)
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    Case 6: with cerebellar haemorrhage
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    Case 7: with coloid cyst
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