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Orbital pseudotumor
Definition:
The orbit is the bony pyramid-shaped cavity of the skull that contains and protects the eyeball and associated structures. Orbital pseudotumor is a swelling of the orbital tissues behind the eye, but unlike cancerous tumors, it cannot invade tissues or spread elsewhere. Alternative Names: Idiopathic orbital inflamatory syndrome (IOIS)
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Causes, incidence, and risk factors:
The cause is unknown. No risk factors are known.
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