intraventricular meningioma
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Intraventricular meningiomas, although are rare intracranial tumors, are a common type of intraventricular neoplasm in adults. They account for less than 3% of all meningiomas.
On imaging, they classically present as vividly enhancing solid mass at the trigone of the lateral ventricles.
Epidemiology
Most intraventricular meningiomas presentbetween the 3 and 6 decades with a recognized female predilection (M:F ratio of 1:2) .
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.
Pathology
Intraventricular meningiomas are thought to arise from mengingothelial inclusion bodies located in the tela choroidea and/or mesenchymal stroma of the choroid plexus . In general, these meningiomas are most commonly of the fibrous meningiomas .
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 more common in children (20% of pediatric meningiomas).
- 80% trigone of lateral ventricle
- 15% third ventricle
- 5% fourth ventricle
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 is calcified (50% compared to 20% for standard meningioma).
For further discussion of the radiographic appearances of these tumors, 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 the location of the tumor and age of the patient, however, in general considerations should include:
- glial tumor
- choroid plexus metastases
- choroid plexus papilloma (particularly in children)
- CNS lymphoma
See also
Siehe auch:
- Meningeom
- Ependymom
- Nierenzellkarzinom
- intraventrikuläre Neoplasien und Läsionen
- Astrozytom
- Karzinom des Plexus choroideus
- Plexuspapillom
- ZNS Lymphom
- Malignes Melanom
- intraventrikuläre Neoplasien und Läsionen - Überblick
- intraventrikuläres Neurozytom
- Tumoren des Plexus choroideus
- intraventrikuläre Metastasen
- malignes intraventrikuläres Meningeom
- malignes Meningeom
und weiter:
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