85 year-old female with right frontal bony expansile mass seen on MRI. Focal lesion in the right frontal bone adjacent to the frontal sinus demonstrates internal groundglass opacity and is associated with mass effect but no significant edema on the underlying frontal lobe. These findings are consistent with a focus of fibrous dysplasia. No additional lesions are seen within the calvarium.Mild scattered hypodensities within the subcortical white matter consistent with small vessel ischemic disease, unchanged since prior MRI. There is no evidence of intracranial hemorrhage, mass or edema. The ventricles and basal cisterns are normal in size and configuration.The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Focal fibrous dysplasia in the right frontal bone. Otherwise, stable small vessel ischemic changes.