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An infiltrative sclerotic osseous lesion with internal vascular channels centred on the right frontal bone with loss of corticomedullary differentiation and overlying periosteal new bone. Soft tissue component extends into the adjacent right frontal sinus with small volume of soft tissue extending into the extraconal fat along the roof of the right orbit and overlying the periosteal reaction of the outer table of the right frontal bone. No significant intracranial soft tissue component.
Normal aeration of the ethmoid air cells, sphenoid and maxillary sinuses. No other osseous abnormality. No other soft tissue abnormality.
Conclusion: Features are most in keeping with an intraosseous meningioma.