Stereotactic Radiosurgery (SRS) Induced Higher-Grade Transformation of a Benign Meningioma into Atypical Meningioma

Figure 2

Histopathology. (2011) H&E-stained slide shows meningothelial meningioma, WHO grade I (a). Ki67 index (b). (2015) H&E-stained slide shows recurrent WHO grade I meningioma (c). Ki67 index (d). (2018) H&E-stained slide shows recurrent meningioma with atypical features and increased mitoses, WHO grade II (e). Ki67 index elevated (f).

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