BACKGROUND: Primary and secondary optic nerve sheath meningiomas (ONSMs) are neoplasms that account for a large proportion of optic nerve and orbital tumors. The diagnosis is not always ...

The right optic ... optic nerve, an MRI of the orbit was performed, revealing a retrobulbar and contrast-enhancing mass (arrows) growing in a circular manner around the left optic sheath, as ...

optic nerve sheath meningioma (vision loss rarely acute) Lack of an afferent pupillary defect Various maculopathies, bilateral optic neuropathy (including bilateral DON), Susac syndrome ...