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An extra-axial mass is demonstrated on the right, which is isointense to grey matter on both T1 and T2 sequences and vividly enhances. Overlying it is a partially fatty mass also with some central enhancement which is contiguous with the intracranial mass across a thickened skull.
Features suggest a meningioma with transosseous spread. A haemangiopericytoma or possibly a metastasis would be considerations although both would be expected to destroy bone rather than pass through it with hyperostosis.