MKI67 and meningioma: As suggested, meningiomas with Ki-67 ≥ 5% were larger in volume compared to tumors with Ki-67 < 5% (mean 46.3 ± 48.2 and 27.0 ± 25.9 cm3; p < 0.001), Similarly, meningiomas with Ki-67 ≥ 5% had significantly larger EI compared to tumors with Ki-67 < 5% (p < 0.001), and also more likely to present intra-tumoral necrosis (p = 0.008).