Cogan syndrome

Cogan syndrome is a rare, chronic inflammatory disorder characterized by interstitial keratitis (inflammation of the cornea) and vestibuloauditory dysfunction, which includes sensorineural hearing loss, tinnitus, and vertigo resembling Ménière disease. The condition is classified as a systemic vasculitis and can affect multiple organ systems beyond the eyes and ears. It was first described by David Cogan in 1945. The disease is thought to have an autoimmune etiology, though the exact cause remains unknown. It is not considered a hereditary condition. Cogan syndrome primarily affects young adults, with a typical onset between the ages of 20 and 30, though it can occur at any age. In addition to ocular and audiovestibular symptoms, patients may experience systemic vasculitis affecting large, medium, and small blood vessels. This can lead to aortitis (inflammation of the aorta), aortic insufficiency, and involvement of other organs including the musculoskeletal system (arthralgia, myalgia), gastrointestinal tract, kidneys, and central nervous system. Constitutional symptoms such as fever, fatigue, and weight loss are common. Approximately 10-15% of patients may develop life-threatening cardiovascular complications, particularly aortic valve disease requiring surgical intervention. Treatment of Cogan syndrome typically involves systemic corticosteroids as first-line therapy to control inflammation and preserve hearing and vision. Topical corticosteroid eye drops are used for ocular inflammation. In patients who are refractory to corticosteroids or who require long-term immunosuppression, steroid-sparing agents such as methotrexate, azathioprine, cyclophosphamide, mycophenolate mofetil, or biologic agents (e.g., TNF-alpha inhibitors, rituximab) may be employed. Early and aggressive treatment is critical, as delayed therapy can result in permanent sensorineural hearing loss, which occurs in a significant proportion of patients. Cochlear implantation has been used successfully in patients with profound bilateral hearing loss. Cardiovascular complications may require surgical repair, including aortic valve replacement.

Common questions about Cogan syndrome