Quiz: Proptosis, Erythema & Edema

This 14-year-old girl presented with a one-month history of intermittent proptosis, erythema, and edema of her right eye. There is no history of trauma or preceding upper respiratory infection. The symptoms have become worse over the last 6 days. Her visual acuity is 6/30 in the right eye and 6/6 in the left eye. What could it be?

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