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| The
most common primary site of this tumor is intracranial, and it invades the
orbit secondarily. Less
commonly, it arises intraorbitally around the optic nerve.
Orbital meningiomas are more common in middle-aged females.
They tend to be more aggressive tumors in children.
Clinically, these lesions commonly present with a painless decrease
in visual acuity and progressive exophthalmos.
They present less commonly with visual field loss, optic atrophy,
optociliary shunt vessels, lid edema, muscle palsies, retinal striae,
hypertophy or hyperostosis of the bony orbit.
There is also a small increased incidence in von Recklinghausen's
disease. Clinically, an optic
disc exam may reveal disc edema, or disc atrophy with optociliary shunt
vessels (#22108). Pathologically(#22110),
these tumors may show several histologic patterns including
meningotheliomatous or syncytial (large, uniform cells with indistinct
boundaries forming solid sheets) and psammomatous (whorled pattern of
concentric cell layers (#22111). The
central core of some nests become hyalinized and calcified forming
psammona bodies (#22112)-- fibroblastic, angioblastic, or mixed.
-(#23339)
shows the effects of a meningioma on the optic nerve.
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| Clinical
#22108 |
Gross
#22110 |
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| High
Power #22111 |
Med.
Power #22112 |
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