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Examples of different microscopic patterns of brain invasion. Although finger-like invasion is mostly described (A, arrows), several studies also showed meningioma cell clusters/islands in the adjacent CNS parenchyma distant from the main tumor (B, arrow) or single tumor cells diffusely infiltrating the brain (arrows). (A–C) Hematoxylin and eosin staining; *brain tissue; **main meningioma tissue.
