Table 6.

Radiological characteristics of optic nerve sheath meningiomas and optic nerve gliomas https://casebasedneuroophthalmology.pressbooks.com/chapter/optic-nerve-sheath-meningioma/ (accessed on 17 August 2022).

Optic Nerve Meningioma	Optic Nerve Glioma
Calcification of the optic nerve sheath and adjacent bony hyperostosis on CT	No calcification or hyperostosis on CT
Apical expansion of the tumor	Kinking or buckling of the optic nerve
Optical nerve sheath thickening and enhancement with relative sparing of the optic nerve substance (tram tack sign)	Thickening of optic nerve and sheath by the tumor
Prominent contrast enhancement on MRI and CT	Variable contrast enhancement on MRI and CT
Extradural tumor extension	Cystic spaces within the optic nerve