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General
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Clinical images
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Atypical meningioma with surrounding edema

Primary lesion in left nasal cavity

T1-weighted MRI

Case reports
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Treatment
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Gross description
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Micro description
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Micro images
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Tumor cells with macronucleoli

Sheet like growth pattern

Increased mitotic figures



Increased Ki-67 (MIB1) proliferation index

PHH3 highlights mitotic figures

Brain invasion - no clear arachnoid plane

Bone invasion



Nests of cohesive, meningothelial cells

Whorl formation

Micronecrosis

Sheet-like (syncytial) growth

H&E, EMA and Vimentin

H&E

Cytology description
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Cytology images
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Meningothelial cells and whorl

Positive stains
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Negative stains
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Differential diagnosis
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Additional references
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End of CNS tumor > Meningeal tumors > Atypical meningioma



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