What is it?Optic meningioma (also optic nerve meningioma, optic nerve sheath meningioma, and orbital meningioma) is a slow-growing tumor of the optic nerve covering, or meninge. It is a benign neoplasm that can be located in the brain behind the orbit. It normally is identified in adults, most frequently in middle-aged women, and can cause severe, progressive visual loss.
What are the symptoms?
A person with this type of tumor normally has proptosis (the tumor pushes the eye forward so it bulges). When the optic nerve is compressed it can cause optociliary shunt vessels to form, leading to loss of vision. The effects of the tumor depend on the size, location, and degree to which it interferes with the optic nerve and other brain functions. Symptoms can also be double vision and drooping of the eyelid (ptosis).
What is the treatment?
Diagnosis of optic meningioma involves viewing the optic nerve blood vessels, which appears raised if disrupted, and for dilated retinal veins. Ultrasonography is sometimes used to measure the diameter of the optic nerve sheath, and CT imaging of the brain shows the eye is pushed forward by the meningioma and can determine if and how far the meningioma continues into the brain. Treatment involves seeing if and how fast the tumor is spreading. Treatment usually consists of surgery to try to remove the entire meningioma, but sometimes the optic nerve cannot be spared and must also be removed. Therefore, many physicians recommend radiation therapy.
References:
http://www.ispub.com/ostia/index.php?xmlFilePath=journals/ija/vol16n1/meningioma.xml
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