The principal features of CS are interstitial keratitis (IK) and vestibuloauditory neuronitis. This syndrome was reported in 1945 by David Cogan, an ophthalmologist at the Harvard Medical School, who meticulously described the medical history and findings of four patients with recurrent nonsyphilitic IK and Meniere's-like vestibuloauditory symptoms. The ocular component of CS subsequently expanded to include other types of eye inflammation, such as conjunctivitis, episcleritis, scleritis, and retinal vasculitis. Later cases also brought to light the association between CS and aortitis and systemic vasculitis, as well as the involvement of other organ systems.
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