Fig 5. Tumor blood flow in each histologic group. The plot shows absolute tumor blood flow determined by continuous arterial spin-labeling in 10 patients with histologically proved meningiomas in each histologic subtype group. Three atypical and one clear cell subtype was excluded. Error bars indicate standard deviation. The result of Tukey-Kramer Multiple Comparisons Test is shown as ns (not significant: P > .05) and ** (significant difference: P < .01).