Related Experiment Videos
[Two cases of neuralgic amyotrophy]
1Department of Neurology, Teikyo University School of Medicine, Ichihara Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|December 30, 1998
Summary
Neuralgic amyotrophy can present with varying muscle biopsy findings. Case 2 showed significant neurogenic changes, unlike Case 1, potentially explaining differing clinical courses in this rare nerve disorder.
Area of Science:
- Neurology
- Pathology
Background:
- Neuralgic amyotrophy (NA), also known as Parsonage-Turner syndrome, is an idiopathic neuropathy characterized by acute onset of severe upper limb pain followed by muscle weakness and atrophy.
- Detailed muscle biopsy findings in NA are not well-documented, limiting understanding of its pathological spectrum.
Observation:
- Two cases of NA are presented: Case 1 (27M) with fever, bilateral upper arm pain, and subsequent weakness; Case 2 (60M) with left shoulder/arm pain, atrophy, and weakness.
- Electromyography (EMG) in Case 1 showed mild neuromuscular unit (NMU) decrease, while Case 2 exhibited marked NMU decrease.
- Muscle biopsy in Case 2 revealed significant neurogenic changes, including grouped and type 2 fiber atrophies and targetoid fibers, contrasting with a normal biopsy in Case 1.
Findings:
- Muscle biopsy findings in NA can vary significantly, with Case 2 demonstrating marked neurogenic changes.
- The presence of substantial neurogenic changes on biopsy may correlate with a more severe or prolonged clinical course, as suggested by the persistent weakness in Case 2.
Implications:
- This study highlights the importance of detailed muscle biopsy in diagnosing and understanding the prognosis of neuralgic amyotrophy.
- The distinct pathological findings between the two cases underscore the heterogeneity of NA and warrant further investigation into the factors influencing its clinical presentation and progression.