Intraventricular meningioma
Updates to Article Attributes
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.
Epidemiology
Most intraventricular meningiomas presentbetween the 4th and 6th decades 3 with a recognised female predilection (M:F ratio of 1:2) 4.
Clinical presentation
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.
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)
- 80% trigone of lateral ventricle
- 15% third ventricle
- 5% fourth ventricle
Pathology
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 fibroblastic variety 5.
Radiographic features
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.
Treatment and prognosis
As is the case with other meningiomas, provided complete excision is possible, surgical excision is curative and therefore the treatment of choice.
Differential diagnosis
The differential somewhat depends on location and age of the patient, however in general considerations should include:
- glial tumour
- choroid plexus metastasis, e.g.
- choroid plexus papilloma (particularly in children)
- CNS lymphoma
See also
-<p><strong>Intraventricular meningiomas</strong> are rare intracranial tumours that represent an uncommon subtype of the more-classical extra-axial <a href="/articles/meningioma">meningioma</a> and represent between 0.5 and 2% of all meningiomas. Despite its rarity, they represent one of the commonest <a href="/articles/adult-intraventricular-neoplasms">adult intraventricular neoplasms</a> <sup>4</sup>.</p><h4>Epidemiology</h4><p>Most intraventricular meningiomas present<sup> </sup>between the 4<sup>th</sup> and 6<sup>th</sup> decades <sup>3</sup> with a recognised female predilection (M:F ratio of 1:2) <sup>4</sup>.</p><h4>Clinical presentation</h4><p>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 <a href="/articles/obstructive_hydrocephalus">hydrocephalus</a>. </p><h5>Location</h5><p>They are most frequently (80%) seen at the <a href="/articles/trigone">trigone</a> of the <a href="/articles/lateral-ventricles">lateral ventricles</a> and for reasons that are not clear, slightly more frequently on the left. Considering the distribution of meningiomas, the intraventricular location is <em>comparatively </em>commoner in children (20 % of <a href="/articles/paediatric-meningiomas">paediatric meningiomas</a>)</p><ul>- +<p><strong>Intraventricular meningiomas</strong> are rare intracranial tumours that represent an uncommon subtype of the more-classical extra-axial <a href="/articles/meningioma">meningioma</a> and represent between 0.5 and 2% of all meningiomas. Despite its rarity, they represent one of the commonest <a href="/articles/adult-intraventricular-neoplasms">adult intraventricular neoplasms</a> <sup>4</sup>.</p><h4>Epidemiology</h4><p>Most intraventricular meningiomas present<sup> </sup>between the 4<sup>th</sup> and 6<sup>th</sup> decades <sup>3</sup> with a recognised female predilection (M:F ratio of 1:2) <sup>4</sup>.</p><h4>Clinical presentation</h4><p>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 <a href="/articles/obstructive-hydrocephalus">hydrocephalus</a>. </p><h5>Location</h5><p>They are most frequently (80%) seen at the <a href="/articles/trigone">trigone</a> of the <a href="/articles/lateral-ventricles">lateral ventricles</a> and for reasons that are not clear, slightly more frequently on the left. Considering the distribution of meningiomas, the intraventricular location is <em>comparatively </em>commoner in children (20 % of <a href="/articles/paediatric-meningiomas">paediatric meningiomas</a>)</p><ul>
Image 7 MRI (T1 C+) ( create )
