A meningioma can proceed from the optic nerve (meningioma of the optic nerve sheath) or from within the cranium (sphenoid meningioma). Symptoms vary depending on the location of the tumor. Exophthalmos, limited motility, and compressive optic neuropathy can result. Hyperostoses are frequent findings in radiographic studies. Treatment consists of neurosurgi-cal removal of the tumor. Like neurinomas, 16% of all meningiomas are associated with neurofibromatosis (Recklinghausen's disease). Meningiomas of the optic nerve sheath are usually histologically benign but can recur if not completely removed. Interestingly, the average age of patients is 32; 20% are younger than 20.
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