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Myopathy in two siblings with nephropathic cystinosis
Kastrup1, Koeppen, Schwechheimer
1Department of Neurology, University of Essen, Hufelandstr. 55, D-45122, Essen, Germany.
European Journal of Neurology
|April 22, 1999
Summary
Nephropathic cystinosis, a hereditary lysosomal storage disorder, can cause neurological complications like distal myopathy. This study reports two siblings with cystinosis and distal myopathy, highlighting its typical clinical presentation and discussing potential cysteamine therapy effects.
Area of Science:
- Biochemistry
- Genetics
- Neurology
Background:
- Nephropathic cystinosis is a hereditary lysosomal transport defect causing cystine accumulation.
- Renal failure necessitates transplantation, leading to increased life expectancy.
- Neurological complications, including distal myopathy, are increasingly recognized in cystinosis patients.
Purpose of the Study:
- To report rare cases of distal myopathy in siblings with nephropathic cystinosis.
- To confirm the electrophysiological and biopsy findings of distal myopathy in vivo.
- To discuss the potential impact of cysteamine therapy on myopathy progression.
Main Methods:
- Case report of two siblings with nephropathic cystinosis.
- Electrophysiological studies to assess muscle function.
- Muscle biopsy for histopathological examination.
Main Results:
- Both siblings presented with a predominantly distal myopathy.
- Clinical presentation resembled a neurogenic atrophy, typical for cystinosis.
- Electrophysiological and biopsy results confirmed the diagnosis of myopathy during life.
Conclusions:
- Distal myopathy is a significant neurological complication of nephropathic cystinosis.
- Early diagnosis and management are crucial for patients with cystinosis.
- Further research is needed to understand cysteamine's effect on cystinosis-associated myopathy.
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