This is an inflammation of the periosteum lining the orbital cavity, usually due to bacterial infection such as actinomycosis, tuberculosis, or syphilis. Less frequently, the disorder is due to osteomyelitis or, in infants, tooth germ inflammations. The clinical symptoms are similar to orbital cellulitis although significantly less severe and without limitation of ocular motility. Liquefaction of the process creates an orbital abscess; large abscesses may progress to orbital cellulitis.
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