Diagnosis of Optic Nerve Sheath Meningioma

Eye exam will often show a swollen or pale optic nerve. Enlarged vessels called optociliary shunt vessels may appear, indicating that the tumor is compressing the veins draining blood from the eye. Magnetic resonance imaging is the gold standard for visualization of ONSM. Advances in neuroimaging have allowed the diagnosis of ONSM to be made on the basis of clinical and neuroimaging findings without the need for biopsy. Early detection is the key to initiate intervention and prevent growth.