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Muscle fiber type disproportion with an autosomal dominant inheritance
1Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
Yonsei Medical Journal
|May 19, 2000
Summary
Congenital muscle fiber type disproportion (CFTD) typically presents with mild weakness. This study highlights a family with CFTD exhibiting significant progressive weakness, challenging typical clinical presentations.
Area of Science:
- Neurology
- Pathology
- Genetics
Background:
- Congenital muscle fiber type disproportion (CFTD) is a congenital myopathy defined by small type 1 muscle fibers.
- Clinical features usually include hypotonia, nonprogressive weakness, and skeletal deformities.
- However, CFTD can present in diverse clinical scenarios.
Purpose of the Study:
- To describe the clinicopathologic features of a family with CFTD.
- To highlight an unusual presentation of CFTD with progressive weakness and absence of neonatal hypotonia.
- To review the spectrum of muscle fiber type disproportion.
Main Methods:
- Clinical assessment of a mother and her two children.
- Muscle biopsy analysis to confirm muscle fiber type disproportion.
- Review of existing literature on CFTD.
Main Results:
- Muscle biopsy revealed muscle fiber type disproportion in the mother.
- The family presented with significant progressive weakness, unlike typical CFTD.
- Neonatal hypotonia and common musculoskeletal deformities were absent in this family.
Conclusions:
- CFTD can manifest with progressive weakness and atypical clinical features.
- This case expands the understanding of CFTD's clinical variability.
- Further research is needed to elucidate the genetic and molecular basis of diverse CFTD presentations.