AKT1 and meningioma: Consistent with intracranial meningiomas, the histologic subtype of NF2-mutant meningiomas was variable (7 meningothelial, 16 psammomatous, 4 transitional, 5 fibrous), while all but 1 AKT1-mutant meningioma showed a meningothelial histology (93.3%, p = 0.0001).