Orbital Myositis: Symptoms, Causes and Treatments

Written by Medicover Team and Medically Reviewed by Dr Manaswini Priya Varanasi , Ophthalmologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Orbital myositis is a rare inflammatory condition affecting the extraocular muscles, leading to eye pain, swelling, and impaired movement. This condition can significantly impact the quality of life, making early diagnosis and appropriate treatment crucial.

It is an idiopathic inflammatory condition targeting the extraocular muscles, which are responsible for controlling eye movements. This condition is a subtype of idiopathic orbital inflammation (IOI) and is characterized by acute or subacute onset of symptoms. The inflammation can be unilateral or bilateral and often presents with significant pain and swelling.

What Are the Symptoms of Orbital Myositis?

Symptoms of orbital myositis include severe eye pain, swelling, redness, double vision, bulging of the eye, and painful or restricted eye movements. Chronic cases may lead to persistent discomfort, muscle scarring, and long-term vision or eye movement problems.

Acute Symptoms

The acute phase of orbital myositis can present with a range of symptoms, including:

Severe eye pain, often exacerbated by eye movements
Swelling and redness of the eyelid
Double vision (diplopia)
Restricted eye movements
Proptosis (bulging of the eye)

Chronic Symptoms

In chronic cases, symptoms may persist or recur, leading to:

Persistent eye pain
Chronic swelling
Fibrosis of the extraocular muscles, causing permanent restriction of eye movements
Vision impairment due to prolonged inflammation

What Causes Orbital Myositis?

Idiopathic Nature

The exact cause of orbital myositis remains unknown, making it idiopathic. However, it is believed to involve an autoimmune mechanism where the body's immune system mistakenly attacks the extraocular muscles.

When Should You See a Doctor for Orbital Myositis?

Consult an ophthalmologist if symptoms affect daily life, persist, or worsen over time.

Severe eye pain, especially during eye movement
Swelling or redness around one or both eyes
Double vision or blurred vision
Difficulty moving the eye in any direction
Bulging of the eye or sudden vision changes

Early diagnosis helps prevent complications and improve outcomes.

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How Is Orbital Myositis Diagnosed?

Doctors diagnose orbital myositis through a detailed eye examination, medical history, and imaging studies such as MRI or CT scans to evaluate the eye muscles. Blood tests may also be performed to identify inflammation or rule out underlying autoimmune diseases.

Clinical Examination

A thorough clinical examination is the first step in diagnosing orbital myositis. This includes assessing the patient's medical history, symptomatology, and conducting a physical examination of the eyes.

Imaging Techniques

Imaging plays a crucial role in diagnosing and differentiating orbital myositis from other orbital pathologies. Common imaging modalities include:

Magnetic Resonance Imaging (MRI): MRI is the preferred imaging technique as it provides detailed images of the extraocular muscles and surrounding tissues. It can reveal muscle enlargement, inflammation, and other characteristic findings of orbital myositis.
Computed Tomography (CT) Scan: CT scans can also be used to assess the extent of muscle involvement and rule out other orbital conditions.

Laboratory Tests

While there are no specific blood tests for orbital myositis, laboratory investigations may be performed to rule out underlying systemic conditions. These may include:

Complete blood count (CBC)
Erythrocyte sedimentation rate (ESR)
C-reactive protein (CRP)
Autoantibody tests for autoimmune disorders

What Are the Treatment Options for Orbital Myositis?

Treatment mainly involves corticosteroids to reduce inflammation and relieve symptoms. For recurrent or severe cases, immunosuppressive medications, low-dose radiotherapy, or rarely surgery may be recommended to prevent complications and preserve eye function.

Corticosteroids

Corticosteroids are the mainstay of treatment for orbital myositis. They are highly effective in reducing inflammation and alleviating symptoms. Treatment typically involves:

Oral Corticosteroids: Prednisone is commonly prescribed at high doses initially, followed by a gradual tapering based on the clinical response.
Intravenous Corticosteroids: In severe cases, intravenous methylprednisolone may be administered for rapid symptom control.

Immunosuppressive Agents

For patients who do not respond adequately to corticosteroids or those with recurrent disease, immunosuppressive agents may be considered. These include:

Methotrexate
Azathioprine
Mycophenolate mofetil

Radiotherapy

In refractory cases, low-dose radiotherapy may be employed to reduce inflammation and prevent fibrosis. This approach is typically reserved for patients who have not responded to pharmacological treatments.

Surgical Intervention

Surgical intervention is rarely required but may be considered in cases with significant fibrosis or complications such as optic nerve compression. Surgical options include:

Orbital decompression
Tenotomy

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Who Is at Risk of Developing Orbital Myositis?

While the precise causes are unclear, several risk factors have been identified:

Autoimmune Disorders: Conditions such as rheumatoid arthritis, lupus, and thyroid eye disease may predispose individuals to orbital myositis.
Infections: Some cases have been linked to viral infections, although this is not well established.
Age and Gender: Orbital myositis can occur at any age but is most commonly diagnosed in young to middle-aged adults. Women are more frequently affected than men.

What Is the Prognosis for Orbital Myositis and How Is It Managed Long-Term?

Prognosis

The prognosis for orbital myositis varies depending on the severity and duration of the disease. While many patients respond well to corticosteroid therapy, some may experience recurrent episodes or develop chronic inflammation leading to fibrosis and persistent symptoms.