Right frontal atypical meningioma

64-year-old with pathologically proven grade 2 meningioma. Transverse axial T2-weighted MRI (A) shows a right frontal mass with a broad dural base but an irregular shape and large volume associated with T2-hyperintense vasogenic edema (arrows) causing leftward midline shift. The tumor itself is better visualized on postcontrast T1-weighted axial (B) and coronal (C) images, which demonstrate a broad dural base and intense enhancement that are typical of meningioma. The irregular shape and large volume of surrounding edema is not typical of most grade 1 meningiomas.