Optic nerve sheath meningiomas

      As in the intracranial compartment, meningiomas of the orbit occur most commonly in middle-aged females. They usually have a tubular appearance on CT or MR as opposed to the fusiform or globular shape of optic gliomas. Meningiomas enhance more than gliomas and the "railroad track" appearance is a characteristic feature. Calcification within the lesion favors a meningioma. Hyperostosis around the optic canal is another sign for meningioma.  

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