Cogan Syndrome

What happens in Cogan syndrome

The immune system targets tissues in the cornea and the inner ear (cochlea and vestibular system), possibly through antibodies that cross-react with proteins in both. The exact cause is unknown. A viral or bacterial infection, often an upper respiratory infection, precedes symptoms in some people.

Two forms are described:

• Typical: interstitial keratitis (inflammation in the middle layer of the cornea) plus inner ear symptoms resembling Ménière's disease, appearing within 2 years of each other.
• Atypical: other eye inflammation, such as uveitis, scleritis or episcleritis, or a longer gap between eye and ear symptoms.

Symptoms

Eyes

• red, painful eyes
• light sensitivity
• blurred vision and watering
• sometimes both eyes

Inner ear

• sudden attacks of vertigo with nausea and vomiting
• ringing in the ears (tinnitus)
• fluctuating, then often progressive hearing loss, commonly in both ears
• unsteadiness that can persist between attacks

Without treatment, hearing loss can progress to deafness within months.

Elsewhere in the body

About 1 in 10 people develop aortitis (inflammation of the aorta) or vasculitis of other vessels, which can damage heart valves or narrow arteries. Fever, fatigue, weight loss, headaches, joint pain and swollen lymph nodes can occur.

Diagnosis

There is no single test. Diagnosis is based on the pattern of symptoms after ruling out other causes, especially syphilis, which can cause interstitial keratitis and hearing loss.

• Eye examination with a slit lamp to identify keratitis or uveitis.
• Hearing tests (audiometry) showing sensorineural hearing loss.
• Balance tests for vestibular function.
• Blood tests: inflammatory markers (ESR, CRP), syphilis and other infection tests, autoimmune screens.
• MRI of the inner ear and brain to exclude other causes.
• Imaging of the aorta and heart (echocardiogram, CT or MR angiography) to check for vasculitis.

Treatment

• Eye inflammation: steroid eye drops and dilating drops, managed by an ophthalmologist.
• Inner ear disease: high-dose oral steroids started promptly, sometimes followed by steroid-sparing medicines such as methotrexate, azathioprine, cyclophosphamide, or biologics like TNF inhibitors (infliximab) for resistant cases.
• Vasculitis: immunosuppressive treatment and, if needed, surgery for aortic valve or vessel damage.
• Hearing loss: hearing aids, and cochlear implants for profound deafness, which work well in Cogan syndrome.
• Vestibular rehabilitation to improve balance.

Treatment is coordinated between ophthalmology, ENT and rheumatology.

Outlook

Eye inflammation usually responds well to treatment, and serious vision loss is uncommon. Hearing is more vulnerable: a significant proportion of people develop severe hearing loss despite treatment, which is why early aggressive therapy matters. Cardiovascular involvement determines long-term risk and needs regular monitoring.

Frequently asked questions

What are the symptoms of Cogan syndrome?

The main symptoms are red, painful, light-sensitive eyes and blurred vision, along with sudden attacks of vertigo, nausea, ringing in the ears and hearing loss. Some people also have fever, fatigue, joint pain or inflammation of the aorta.

Is Cogan syndrome the same as Ménière's disease?

No. The ear attacks resemble Ménière's disease, with vertigo, tinnitus and hearing loss, but Cogan syndrome also involves eye inflammation and is autoimmune. It usually affects both ears and can progress faster.

Can hearing loss from Cogan syndrome be reversed?

Early treatment with high-dose steroids and other immunosuppressants can stabilize or partly restore hearing. If profound hearing loss occurs, cochlear implants can restore useful hearing for many people.

Is Cogan syndrome hereditary?

It is not known to be inherited. It is thought to be an autoimmune reaction, possibly triggered by an infection, in people with a susceptible immune system.