Large left frontal convexity extra-axial heterogeneously enhancing dural based tumour is associated with dural thickening and central 'spoke-wheel' vascularity. There is considerable mass-effect on the underlying brain and in some locations, it is difficult to identify a clear plane between the mass and the brain; this may represent focal brain invasion. The adjacent superior frontal gyrus appears thickened, although this likely due to mass effect rather than a primary gyral abnormality. There is no extension into or through the adjacent bone.
Moderately extensive white matter disease, likely of ischaemic nature. Old superior right cerebellar infarct.
Conclusion:
The mass most likely represents a meningioma. Far less likely differential diagnoses to consider are dural metastases or a haemangiopericytoma (although the spoke-wheel vascularity and absence of skull destruction make this unlikely).