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An 8-year-old boy is brought to the physician by his mother for a 2-day history of swelling of the left eye. He recently had an upper respiratory tract infection. Temperature is 102 F. On examination, there is erythema and edema of the periorbital tissue, and difficulty opening the left eye due to the swelling. His eye movements are restricted and there is proptosis. Which of the following is the most likely diagnosis?
Blepharitis
Cavernous sinus thrombosis
Hyphema
Orbital cellulitis
Pre-septal cellulitis
