 Again seen is a lesion in the right frontal bone which is T2 hyperintense, T1 hypointense, and enhancing, without diffusion restriction measuring approximately 19 x 8 x 9 mm (series 1001, image 26; series 1101, image 25) in the axial and sagittal planes. This lesion abuts the dura, is primarily intraosseous, extending across the calvarium, and does not have mass effect on the subjacent parenchyma. There is an additional intracranial lesion that appears to be dural based overlying the right frontal lobe, which is T1 hypointense and enhancing, measuring 7 x 8 mm (series 1001, image 17), with mild adjacent mass effect on the brain parenchyma and no resulting vasogenic edema.The ventricles and sulci are normal in size. The cerebellar tonsils are in normal position. The pituitary gland is normal in size. There is no evidence for intracranial hemorrhage or acute infarction. No diffusion-weighted abnormalities are identified. The major vessels appear patent. There is an extra fluid and ethmoid mucosal thickening. There is no abnormal enhancement within the brain.
1.Lesion in the right frontal calvarium is is favored to represent a plasmacytoma, metastatic disease or osseus malignancy.2.Right frontal dural based subcentimeter lesion is favored to represent a meningioma.