Ocular Cellulitis

Orbital cellulitis is an infection causing inflammation of the orbital contents posterior to the orbital septum. These contents include the periorbital fat and extra-ocular muscles, but exclude the involvement of the globe itself.  In distinction, preseptal (periorbital) cellulitis is an infection anterior to the orbital septum, mainly involving the eyelids.  Although periorbital cellulitis is a much more common entity, especially in children, it is important to recognize the differences of orbital cellulitis as its complications are much more severe and can become life-threatening. 
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