A 28-year-old woman presented with complaints of acute-onset severe bursting headache with vomiting for 7 days and pain, redness, swelling of eyelids, and bulging of the right eye for 2 days. She had a history of treatment for rhinosinusitis 15 days prior when she received 625 mg of oral augmentin (amoxicillin and clauvalanic acid) 3 times daily for 10 days based on culture sensitivity (Staphylococcus aureus) of purulent discharge from the right sphenoidal sinus. On examination, she had severe chemosis with a ballooned-out palpebral conjunctiva with visible pulsation, marked eyelid edema, and proptosis of the right eye (Video).