From the histopathological point of view, the 6 NF2 mutated benign/grade I meningiomas showed a variable histology including 3 transitional meningiomas, two meningothelial tumors and one fibroblastic tumor, the frequency of transitional tumors being slightly higher than among non-mutated cases (3/6 vs 4/14 cases; p > 0.05) (Table 1). Here, NF2 is linked to tumor of meninges.