A 28-year-old man with acute orbital cellulitis secondary to ethmoid sinusitis is being evaluated for complications. On day 3 of IV ceftriaxone and vancomycin, he develops sudden worsening of proptosis, complete ophthalmoplegia, and a fixed dilated pupil. Which imaging finding would best discriminate the development of cavernous sinus thrombosis from uncomplicated orbital cellulitis?

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