Meningioma arises from the meningothelial cells that make up the arachnoid villi of the meninges. It is the most common brain tumor, accounting for 36.4% of all primary brain tumors in the USA . It is more common in women than men . According to the World Health Organization (WHO), meningiomas are categorized into 3 grades (grades I-III). Criteria include cell type, mitotic activity, cellularity, necrosis, and brain invasion. WHO grade I or benign, grade II (atypical) and grade III represent approximately 90%, 5%-7% and 3% of all meningiomas, respectively .