Intraventricular meningioma

Intraventricular meningiomas are rare intracranial tumours that represent an uncommon subtype of the more classical extra-axial meningioma and represent between 0.5 and 2% of all meningiomas. Despite its rarity, they represent one of the commonest adult intraventricular neoplasms 4.

Most intraventricular meningiomas present between the 4th and 6th decades 3 with a recognised female predilection (M:F ratio of 1:2) 4.

Intraventricular meningiomas present usually due to mass effect, either by direct compression of the adjacent brain, or from obstruction to normal CSF drainage with resultant hydrocephalus.

Intraventricular meningiomas are thought to arise from mengingothelial inclusion bodies located in the tela choroidea and/or mesenchymal stroma of the choroid plexus  5. In general, these meningiomas are most commonly of the fibrous meningiomas 5.

Location

They are most frequently (80%) seen at the trigone of the lateral ventricles and for reasons that are not clear, slightly more frequently on the left. Considering the distribution of meningiomas, the intraventricular location is comparatively commoner in children (20% of paediatric meningiomas)

Their signal and attenuation characteristics are the same as other meningiomas, demonstrating essentially isodensity and intensity to grey matter precontrast and vivid, usually homogenous enhancement following administration of contrast. Compared to extra-axial meningiomas, a greater proportion are calcified (50% compared to 20% for standard meningioma).

For further discussion of the radiographic appearances of these tumours, refer to the general article: meningioma.

As is the case with other meningiomas, provided complete excision is possible, surgical excision is curative and therefore the treatment of choice.

The differential somewhat depends on location and age of the patient, however in general considerations should include:


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Article Information

rID: 1523
Section: Pathology
Synonyms or Alternate Spellings:
  • Intraventricular meningiomas

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