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**Irregular calcifications (confluent psammoma bodies).
*Usually found in spinal cord.
<gallery>
File:Psammomatous_meningioma.jpg | Numerous psammoma bodies (WC/jensflorian)
File:NP psammomatous meningioma 0002.jpg | Psammomatous meningioma after EDTA treatment (WC)
</gallery>
=====Angiomatous meningioma=====
*AKA vascular.
*May bleed like stink.
*May show extensive edema.
*Hyalinized vessels dominate over tumor cells.
*Degenerative nuclear atypia.
DDx:
*Vascular malformatons
*Hemangioblastoma
<gallery>
File:Angiomatous_meningioma_HE_x100.jpg | Angiomatous meningioma (WC/jensflorian)
</gallery>
=====Microcystic meningioma=====
Microscopic:
*Cystic appearance.
*Increased cytologic pleomorphism of the elongated cells.
DDx:
*Clear cell meningioma
*Hemangioblastoma
<gallery>
File:Microcystic_meningeoma_HE_x100.jpg | Microcyts (WC/jensflorian)
</gallery>
=====Secretory meningioma=====
*Associated with brain edema; may have a worse outcome.
Microscopic:<ref>URL: [http://moon.ouhsc.edu/kfung/jty1/Com04/Com405-1-Diss.htm http://moon.ouhsc.edu/kfung/jty1/Com04/Com405-1-Diss.htm]. Accessed on: 12 October 2011.</ref>
*Eosinophilic intracytoplasmic inclusions that are [[CEA]] +ve and [[PAS]] +ve.
Molecular:
* Combined KLF4 K409Q and TRAF7 mutations.<ref>{{Cite journal | last1 = Reuss | first1 = DE. | last2 = Piro | first2 = RM. | last3 = Jones | first3 = DT. | last4 = Simon | first4 = M. | last5 = Ketter | first5 = R. | last6 = Kool | first6 = M. | last7 = Becker | first7 = A. | last8 = Sahm | first8 = F. | last9 = Pusch...
DDx:
*Metastatic [[mucinous adenocarcinoma]].
*Pituitary adenoma
<gallery>
File:Secretory_meningioma_HE_x200.jpg | Secretory granules (WC/jensflorian)
File:Secretory_meningioma_PAS.jpg | PAS-positive secretory granules (WC/jensflorian)
File:Secretory_meningioma_HE_smear.jpg | Smear with secretory granules (WC/jensflorian)
</gallery>
Images:
*[http://moon.ouhsc.edu/kfung/jty1/Com04/Com04Image/Com405-1-8.gif Secretory meningioma (ouhsc.edu)].<ref>URL: [http://moon.ouhsc.edu/kfung/jty1/Com04/Com405-1-Diss.htm http://moon.ouhsc.edu/kfung/jty1/Com04/Com405-1-Diss.htm]. Accessed on: 3 January 2012.</ref>
*[http://path.upmc.edu/cases/case370.html Secretory meningioma - several images (upmc.edu)].
=====Lymphoplasmacyte-rich meningioma=====
Microscopic:
*Lymphocytes.
*Plasma cells.
Images:
*[http://path.upmc.edu/cases/case225/micro.html Lymphoplasmacyte-rich meningioma - case 1 - several images (upmc.edu)].
*[http://path.upmc.edu/cases/case247/micro.html Lymphoplasmacyte-rich meningioma - case 2 - several images (upmc.edu)].
*[http://path.upmc.edu/cases/case528.html Lymphoplasmacyte-rich meningioma - case 3 - several images (upmc.edu)].
=====Metaplastic meningioma=====
*No clinical significance.
*Probably do not represent true metaplasia in all cases.
*Clincal information is rquired to distinguish between bone invasion and meningiomas with bone formation.
Microscopic:
*Cartilage or bone formation.
*Myxoid or xanthomatous changes.
<gallery>
File:Metaplastic_osseous_meningioma.jpg | Ossified meningioma, HE stain. (WC/jensflorian)
File:Metaplastic_xanthomatous_meningioma.jpg | Metaplastic meningioma with xanthomatous changes. (WC/jensflorian)
</gallery>
====Grade II====
=====Brain invasive meningioma=====
*Invades the brain (irregular, tongue-like).
*Absence of leptomeningeal layer.
*Brain invasion can be present in grade I tumors, these are then classified as "atypical", ie. as grade II tumors.
*The prognostic significance of brain invasion is still unclear, some studies do not show a course similiar to grade II meningiomas.<ref>{{Cite journal | last1 = Baumgarten | first1 = P. | last2 = Gessler | first2 = F. | last3 = Schittenhelm | first3 = J. | last4 = Skardelly | first4 = M. | last5 = Tews | first5 = DS....
Images:
*[http://moon.ouhsc.edu/kfung/jty1/Composites/FNA0IE18-Meningioma-Invasion.htm Meningioma with brain invasion (ouhsc.edu)].
<gallery>
File:Brain invasion meningioma.jpg | Finger-like protrusions, HE (WC/jensflorian)
File:Meningioma - brain invasion - very high mag.jpg | Brain invasive meningooma (WC/Nephron)
</gallery>
=====Clear cell meningioma=====
Epidemiology: