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Ms E, 51 years old
History:
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Partial resection 7 month ago: meningioma WHO grade I
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Partial re-resection 1 month ago: now WHO grade II-III
Histology:
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transition to atypical meningioma and malignant meningioma -
WHO grade II-III
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17 mitoses per 10 high power fields (HPF)