Tumors of the meninges are common, probably the most common tumor of the cranial vault. Meningiomas arise from the arachnoid, but because the arachnoid and dura are frequently fused, they may appear to be of dural origin. Meningiomas frequently arise from the arachnoid cap cells, which are arachnoidal projections into dural sinuses for reabsorption of cerebrospinal fluid. This explains the frequency of meningiomas found along the dural sinuses. Meningiomas are considered benign, but recurrences are common. More frequent recurrences are found with the higher grades. Complete surgical removal is associated with a good prognosis. One study showed 20% recurrences within 20 years for meningiomas as a group (Surg Neurol 1986 26:461–469). Prognosis is closely related to surgical resection and tumor grade. This review summarizes grading in three case presentations.