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From the case:
Meningioma with bony invasion
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Meningioma occluding the superior sagittal sinus and eroding into the vertex.
Case Discussion
Meningiomas are extra-axial tumors and represent the most common tumor of the meninges. They are a non-glial neoplasm that originates from the arachnoid cap cells of the meninges. They are typically benign with a low recurrence rate but rarely can be malignant.