Considering the 3% Ki67 cut-off point in grade I meningiomas, suggested by Abry et al. (45), we observed a significant difference between the degree of positivity according to the type of meningioma: transitional meningiomas were more positive (32.1%) than meningothelial (67.9%) and fibrous meningiomas (0.0%) (p = 0.005) (Table 6). This evidence concerns the gene MKI67 and Fibrous Meningioma.