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Multiple concurrent factors including cyst, constriction, and iatrogenic injury can cause radial nerve palsyMultiple factors can cause rare radial nerve palsy in patients

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Key Takeaway
Consider multiple overlapping factors, such as cysts and constrictions, when diagnosing complex cases of radial nerve palsy.

This case study and literature review examines the diagnostic complexities of non-traumatic radial nerve palsy. The authors synthesize findings from a single case where the palsy was caused by three concurrent factors: an elbow joint cyst, an hourglass-like constriction, and an iatrogenic injury. This combination of factors illustrates how multiple overlapping conditions can contribute to a single clinical presentation.

The primary finding is the identification of these specific overlapping mechanisms in a single patient. While the case provides a clear clinical picture of how multiple factors can coexist, the evidence is limited by the small sample size of a single case report.

Clinically, this report serves as a reference for the diagnosis and management of rare clinical entities where multiple factors overlap. It suggests that clinicians should consider multiple potential causes when a patient presents with radial nerve palsy that does not have a single obvious cause. However, the findings are limited to a single case and do not provide a broad basis for general clinical guidelines.

Imagine losing the ability to move your hand or wrist. For some, this happens because of a nerve called the radial nerve. Doctors often look for one clear cause, but this case study shows that sometimes, several problems hit the same nerve at once.

In this specific case, a patient suffered from radial nerve palsy. Instead of one clear culprit, the team identified three overlapping issues: a cyst in the elbow joint, a physical constriction shaped like an hourglass, and an injury caused by a medical procedure. This combination of factors made the diagnosis complex.

Because this is a single case report, the findings are limited. It does not represent a large group of people, but it serves as a helpful guide for doctors. It helps them recognize and manage rare situations where multiple problems overlap to cause nerve damage.

What this means for you:
Multiple overlapping factors like cysts and physical pressure can combine to cause rare nerve damage in the arm.

Common questions

What caused the nerve damage in this patient?

The patient's radial nerve palsy was caused by three different factors happening at the same time. These included a cyst in the elbow joint, a physical constriction shaped like an hourglass, and an injury caused by a medical procedure. This case shows how multiple issues can overlap to cause nerve problems.

How common is this specific type of nerve injury?

This specific case is considered a rare clinical entity. Because the study is a single case report rather than a large trial, it is difficult to say how often these three factors occur together, but it helps doctors recognize these rare overlaps.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedAug 2026
View Original Abstract ↓
While non-traumatic radial nerve palsy is relatively rare, cases triggered by a single etiological factor pose minimal diagnostic and therapeutic challenges. However, for radial nerve palsy driven by multiple factors, the overlapping or masking effects of symptoms and signs from distinct etiologies complicate accurate diagnosis and optimal management. This complexity is further amplified when all contributing factors are rare, presenting a more formidable challenge to precise diagnosis and treatment selection. We present a case of radial nerve palsy attributed to multiple etiological factors, which is notable for the coexistence of three distinct and rare pathogenic entities: elbow joint cyst, hourglass-like constriction, and a specific iatrogenic injury—a combination that is rarely, if ever, documented in the existing literature. Through the synthesis of clinical experience from the diagnostic and therapeutic process and a comprehensive literature review, it aims to provide valuable references for the precise diagnosis and management of such rare clinical entities.
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