Optic nerve meningioma. There is no significant interval change in the well-defined right orbital mass that surrounds the optic nerve and results in marked proptosis, although the mass has gradually increased in size over several years. The right optic nerve is engulfed by the mass and there is remodeling of the orbital vault. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There are a few unchanged scattered foci of nonspecific T2 hyperintensity in the cerebral white matter. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact.
No significant interval change in the well-defined right optic nerve sheath meningioma, although the mass has gradually increased in size over several years.