Parsonage-Turner Syndrome

Parsonage-Turner Syndrome is a rare neurological disorder that causes sudden, severe pain in the shoulder and upper arm, followed by weakness and muscle wasting. It affects the brachial plexus, a network of nerves that sends signals from your spinal cord to your shoulders, arms, and hands. The exact cause is unknown, but it often follows an infection or injury.

What is Parsonage-Turner Syndrome?

Parsonage-Turner Syndrome, also known as neuralgic amyotrophy or brachial neuritis, is a rare condition that affects the nerves in your shoulder and arm. It typically begins with sudden, intense pain in one shoulder or upper arm. This pain is then followed by muscle weakness and a loss of muscle mass (atrophy) in the affected area, making it hard to move your arm.

This syndrome specifically targets the brachial plexus, which is a complex network of nerves. These nerves originate in your spinal cord and extend through your neck and shoulder into your arm and hand. They are responsible for sending signals that control movement and sensation in these areas. While usually affecting one side of the body, Parsonage-Turner Syndrome can sometimes impact both sides. In some cases, it can also affect other parts of the body, such as the diaphragm (the muscle that helps you breathe), legs, or face. It is considered a rare disorder, meaning it does not occur frequently in the general population.

Symptoms

The main symptoms of Parsonage-Turner Syndrome are sudden, severe pain in the shoulder or upper arm, followed by muscle weakness and wasting. The pain is often described as stabbing or burning and can be intense. After the pain subsides, you may notice difficulty moving your arm and a reduction in muscle size.

The initial pain is typically very severe and can last for hours to several weeks. It often affects one shoulder or upper arm but can spread to the neck, back, or chest. Many people find the pain is worse at night, making it difficult to sleep. Once the pain begins to fade, muscle weakness becomes noticeable. This weakness can range from mild to severe, sometimes leading to partial or complete paralysis of the affected muscles. You might also experience muscle wasting, where the muscles appear smaller, and a loss of sensation, such as numbness or tingling, in the affected arm or hand. In rare instances, if the nerves controlling the diaphragm are affected, you might experience difficulty breathing. This is a less common but serious symptom. The specific muscles affected can vary from person to person, depending on which nerves in the brachial plexus are damaged.

Causes & risk factors

The exact cause of Parsonage-Turner Syndrome is unknown, but it is believed to involve an immune system reaction. It often appears after a specific event, such as an infection, surgery, or injury. Certain factors can increase your risk of developing this rare condition.

While the precise reason for the syndrome is not fully understood, medical experts suspect it may be an autoimmune response. This means your body's immune system mistakenly attacks its own healthy nerve tissues, causing inflammation and damage to the brachial plexus nerves. Many cases are triggered by a recent event. Common triggers include viral infections, recent surgeries, vaccinations, strenuous exercise, or physical injuries. Childbirth has also been identified as a potential trigger for some individuals. Risk factors that may increase your likelihood of developing Parsonage-Turner Syndrome include a family history of the condition (indicating a rare genetic form), having other autoimmune diseases like lupus, or experiencing any of the aforementioned triggers such as a recent infection, surgery, or vaccination.

How it's diagnosed

Diagnosing Parsonage-Turner Syndrome involves a thorough physical examination and a review of your symptoms. Your doctor will look for signs of muscle weakness, wasting, and changes in your reflexes. Specialized tests are often used to confirm nerve damage and rule out other conditions.

During the physical exam, your doctor will assess your muscle strength and reflexes in the affected arm and shoulder. They will also check for any visible muscle wasting. Your description of the sudden, severe pain followed by weakness is a key part of the diagnosis. To confirm nerve involvement, your doctor may order electromyography (EMG) and nerve conduction studies (NCS). An EMG measures the electrical activity of muscles, while NCS measures how fast electrical signals travel through your nerves. These tests can identify nerve damage and help pinpoint which nerves are affected. Magnetic resonance imaging (MRI) may also be used. An MRI scan can help rule out other conditions that might cause similar symptoms, such as a herniated disk in your neck or a rotator cuff tear in your shoulder. These imaging tests ensure that the diagnosis is accurate and that you receive the correct treatment.

Treatment options

Treatment for Parsonage-Turner Syndrome focuses on managing pain and supporting recovery of muscle function. Pain relief medications are often prescribed, and physical therapy is crucial to help maintain movement and strengthen affected muscles. The goal is to reduce discomfort and improve your ability to use your arm.

Pain management is a primary focus, especially in the early stages when pain is most severe. Your doctor may recommend over-the-counter pain relievers like nonsteroidal anti-inflammatory drugs (NSAIDs). For more intense pain, prescription medications such as corticosteroids (which reduce inflammation), tricyclic antidepressants, or gabapentin may be used. Physical therapy plays a vital role in recovery. A physical therapist will guide you through exercises designed to maintain the range of motion in your shoulder and arm, prevent stiffness, and gradually strengthen weakened muscles. This therapy helps improve your function and independence over time. Occupational therapy can also be beneficial. An occupational therapist can help you find ways to perform daily tasks and activities while you are recovering, adapting methods to accommodate any muscle weakness or difficulty with movement. Surgery is rarely needed for Parsonage-Turner Syndrome, typically only considered in very rare cases where there is persistent nerve compression.

Recovery & outlook

Recovery from Parsonage-Turner Syndrome can be a long process, often taking many months to several years. Most people do experience some level of recovery, but the extent can vary. Some individuals may have lasting weakness, pain, or numbness, while others regain nearly full function.

The nerves affected by Parsonage-Turner Syndrome heal slowly, which explains the extended recovery period. Consistent engagement with physical and occupational therapy is important during this time to maximize your potential for recovery and adapt to any lingering challenges. While many people recover significant function, complete recovery is not always achieved. Some individuals may continue to experience residual symptoms, such as chronic pain, persistent muscle weakness, or areas of numbness. The specific outcome depends on the severity of the nerve damage and individual factors. Recurrence of Parsonage-Turner Syndrome is possible, though it is considered rare. Your healthcare team will monitor your progress and provide ongoing support throughout your recovery journey, helping you manage any long-term effects and improve your quality of life.

When to see a doctor

You should see a doctor if you experience sudden, severe pain in your shoulder or upper arm, especially if it is followed by muscle weakness or difficulty moving your arm. Early diagnosis and treatment can help manage symptoms and support your recovery. Do not delay seeking medical attention for these symptoms.

If you notice a sudden onset of intense, unexplained pain in your shoulder or upper arm, it's important to consult a healthcare professional. This is particularly true if the pain is followed by any signs of muscle weakness, numbness, or tingling in the affected limb. Prompt medical evaluation is crucial to determine the cause of your symptoms and to rule out other serious conditions that might require different treatments. Your doctor can perform the necessary examinations and tests to accurately diagnose Parsonage-Turner Syndrome or identify another underlying issue. Additionally, if you experience any difficulty breathing alongside your arm symptoms, you should seek immediate medical attention. This could indicate involvement of the phrenic nerve, which controls the diaphragm, and requires urgent assessment.

Frequently asked questions

Is Parsonage-Turner Syndrome a permanent condition?

Parsonage-Turner Syndrome is not usually a permanent condition, but recovery can be very slow. Most people experience some improvement over months to years. However, some individuals may have lasting symptoms like weakness, pain, or numbness, meaning full recovery is not always achieved.

Can Parsonage-Turner Syndrome affect both arms?

While Parsonage-Turner Syndrome most commonly affects only one arm or shoulder, it can, in some cases, affect both sides of the body. It can also affect other areas like the diaphragm, legs, or face, though this is less common.

What is the main difference between Parsonage-Turner Syndrome and a rotator cuff injury?

Parsonage-Turner Syndrome involves nerve damage in the brachial plexus, leading to severe pain followed by muscle weakness and wasting. A rotator cuff injury, on the other hand, is damage to the tendons and muscles around the shoulder joint, typically caused by trauma or overuse, and usually presents with pain and difficulty moving the arm without nerve-related muscle wasting.

Are there any specific exercises to avoid with Parsonage-Turner Syndrome?

During the acute painful phase, you should avoid movements that worsen your pain. As you recover, a physical therapist will guide you on appropriate exercises. It's important not to overdo it or perform exercises that cause sharp pain, as this could hinder recovery. Always follow your therapist's recommendations.

Can stress or anxiety worsen Parsonage-Turner Syndrome symptoms?

While stress and anxiety are not direct causes of Parsonage-Turner Syndrome, they can potentially worsen pain perception and make it harder to cope with chronic symptoms. Managing stress through relaxation techniques or counseling may help improve overall well-being during recovery.

Is Parsonage-Turner Syndrome hereditary?

In most cases, Parsonage-Turner Syndrome is not hereditary. However, there is a rare genetic form of the condition that can run in families. If you have a family history of the syndrome, it's important to discuss this with your doctor.

Sources

• MedlinePlus — Parsonage-Turner Syndrome
• Mayo Clinic — Parsonage-Turner Syndrome
• Cochrane Library — Parsonage-Turner Syndrome