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The MRI sequences demonstrate:
- a well-circumscribed broad-based right frontal parasagittal mass of extra-axial location. It displays an isosignal to the cortical grey matter on T1 and FLAIR, iso-to slight high signal on T2 with a central area of a low signal on all sequences (calcification). The postcontrast sequences show a homogeneous vivid enhancement of the non-calcified component. Moderate surrounding vasogenic edema is noted. A rim of CSF signal around the mass is noted on T2 sequences representing the "CSF cleft sign", indicating its extra-axial location.
- no mass effect on the midline structures or midline shift.
MRI features are most consistent with a right frontal meningioma.