“OPTIC NERVE SHEATH MENINGIOMA”

Benign and slow growing, these arise from the arachnoid layer. They encircle and grow along the nerve sheath.
MRI

•  Mass surrounding the intra-orbital optic nerve that enhances more than the nerve itself, ‘tram track’ enhancement.
•  Calcification in up to 50%.
•  Look for erosion or hyperostosis of the optic canal.



 

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