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Difference between revisions of "Meningioma"
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*May involute into benign sclerotic tissue.<ref>URL: [http://radiographics.rsna.org/content/23/3/785.long http://radiographics.rsna.org/content/23/3/785.long]. Accessed on: 3 November 2010.</ref> | *May involute into benign sclerotic tissue.<ref>URL: [http://radiographics.rsna.org/content/23/3/785.long http://radiographics.rsna.org/content/23/3/785.long]. Accessed on: 3 November 2010.</ref> | ||
=== | ===Morphologic subtypes=== | ||
Many subtypes exist.<ref name=Ref_PSNP194>{{Ref PSNP|194}}</ref> | *Many subtypes exist.<ref name=Ref_PSNP194>{{Ref PSNP|194}}</ref> | ||
*The histologic subtypes generally don't have much prognostic significance. | |||
**Some subtypes are high grade by definition; also see ''histologic grading''. | |||
Grade I | ====Grade I==== | ||
*Meningothelial. | *Meningothelial. | ||
**Most common. | **Most common. | ||
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**Microscopic: cartilage or bone formation. | **Microscopic: cartilage or bone formation. | ||
Grade II | ====Grade II==== | ||
*Invasive (invades the brain). | *Invasive (invades the brain). | ||
*Clear cell. | *Clear cell. | ||
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**Microscopic: myxoid appearance. | **Microscopic: myxoid appearance. | ||
Grade III | ====Grade III==== | ||
*Papillary. | *Papillary. | ||
**Microscopic: true papillae. | **Microscopic: true papillae. | ||
*Rhaboid. | *Rhaboid. | ||
**Microscopic: rhadoid appearance (abundant cytoplasm | **Microscopic: rhadoid appearance (abundant cytoplasm). | ||
===Histomorphologic grading=== | ===Histomorphologic grading=== | ||