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