Cross section demonstrating a broad-based tumor attached to the dura. This particular meningioma has a coarse granular tan-white appearance that may feel "gritty" when cut, particularly if it is rich in Psammoma bodies (a form of dystrophic calcification seen microscopically as concentric lamellated calcified structures). Meningiomas make up 20% to 30% of intracranial tumors and show slight female preponderance (Female:Male = 1.7:1). High-grade meningiomas are more commonly seen in males. Meningiomas are dural-based, slow-growing tumors that are derived from meningothelial (arachnoid cap) cells.