Fig. 2.

Atypical meningioma. a, b Pre- and post-contrast axial T1-weighted MR images showing a heterogeneously enhancing mass with a wide dural base, CSF cleft and bony involvement. The cortical interface is less distinct when compared with Fig. 1, and there is a moderate amount of associated vasogenic oedema. c Axial T2-weighted MR image of the same lesion. d Susceptibility-weighted images show internal calcification