Commonly, it arises due to adjacent sinusitis (also trauma, foreign body, etc.).


•  Inflammation of the peri-orbital fat.
•  With or without focal fluid collection showing rim enhancement.
•  Pre-septal infection is confined to the tissues anterior to the septum (the point of attachment of the eyelid).
•  Post-septal infection is usually extra-conal and may be complicated by subperiosteal phlegmon/abscess, ophthalmic vein/cavernous sinus thrombosis, epidural or subdural empyema, cerebritis or meningitis.


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