What is the prevalence of Parsonage-Turner Syndrome?

Parsonage-Turner Syndrome, also known as neuralgic amyotrophy, is an uncommon condition with an estimated annual incidence of approximately 1 to 3 cases per 100,000 people. While true prevalence is difficult to determine due to frequent misdiagnosis, the condition is considered a rare disorder that primarily affects adults in their third to seventh decades of life.

What is the incidence and prevalence of Parsonage-Turner Syndrome?

The true prevalence of Parsonage-Turner Syndrome is challenging to pinpoint because the condition is frequently misdiagnosed as other shoulder pathologies, such as rotator cuff injuries or cervical radiculopathy. According to data from Orphanet and other clinical registries, the annual incidence is estimated at 1 to 3 per 100,000 individuals. Because Parsonage-Turner Syndrome often resolves or enters a long-term remission phase, many cases go unreported, suggesting that the clinical incidence may be higher than current medical literature reflects.

Who is most affected by Parsonage-Turner Syndrome?

Epidemiological data indicates that Parsonage-Turner Syndrome affects males more frequently than females, with a reported male-to-female ratio ranging from 2:1 to 4:1. While the condition can occur at any age, it is most commonly diagnosed in adults between the ages of 30 and 70. Pediatric cases of Parsonage-Turner Syndrome exist but are significantly less common, often leading to diagnostic delays in younger populations.

Are there geographic or genetic risk factors?

There is no evidence suggesting that Parsonage-Turner Syndrome is restricted to specific geographic regions or ethnic groups. Research is ongoing regarding the hereditary component, as approximately 10% to 20% of patients with the hereditary form of the condition (HNA) show mutations in the SEPT9 gene. However, the vast majority of cases seen in clinical practice are sporadic. The 160 individuals currently connected via the DiseaseMaps.org community provide a vital real-world perspective, demonstrating that despite the rarity of Parsonage-Turner Syndrome, patients across diverse demographics share similar trajectories of sudden-onset pain followed by muscular atrophy.

Why is accurate data on Parsonage-Turner Syndrome difficult to obtain?

• Diagnostic Complexity: The initial presentation of severe pain often mimics orthopedic injuries, leading patients to seek help from surgeons rather than neurologists.


• Self-Limiting Nature: Because the acute pain phase often subsides on its own, many patients do not pursue further diagnostic testing like electromyography (EMG).


• Lack of Awareness: Many general practitioners are not trained to recognize the specific pattern of brachial plexus involvement characteristic of Parsonage-Turner Syndrome.


• Underreporting: Mild cases that do not result in significant long-term weakness are rarely documented in clinical literature.

Next steps

• Consult with a neurologist or a physiatrist who specializes in peripheral nerve disorders.


• Request an electromyography (EMG) and nerve conduction study if you suspect your symptoms align with this condition.


• Connect with the 160 members on DiseaseMaps.org to share experiences and learn about regional specialists.


• Keep a detailed pain and symptom diary to help your physician track the progression from the acute pain phase to the recovery phase.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.

References

• Orphanet: Neuralgic Amyotrophy (ORPHA:732).


• NIH Genetic and Rare Diseases Information Center (GARD): Parsonage-Turner Syndrome.


• PubMed: "Neuralgic amyotrophy: an update" (Clinical review of incidence and pathophysiology).


• OMIM (Online Mendelian Inheritance in Man): Hereditary Neuralgic Amyotrophy entry #162100.