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Autosomal dominant centronuclear myopathy with unique clinical presentations
Jee Young Lee1, Ju Hong Min, Yoon Ho Hong
1Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
Journal of Korean Medical Science
|December 29, 2007
Summary
Autosomal dominant centronuclear myopathy can present with unusual distal leg weakness, expanding the known clinical spectrum of this neuromuscular disorder. This finding highlights the importance of considering genetic myopathies even with atypical symptoms.
Area of Science:
- Neurology
- Genetics
- Muscle Diseases
Background:
- Centronuclear myopathies (CNM) are a group of inherited neuromuscular disorders characterized by specific muscle fiber abnormalities.
- These conditions are known for clinical and genetic heterogeneity, typically involving centrally located nuclei and type 1 fiber hypotrophy.
Observation:
- Two patients from a single family presented with symptoms initially mimicking distal myopathy.
- Clinical manifestations included significant muscle weakness and atrophy predominantly in the posterior compartment of the lower legs.
- Magnetic resonance imaging confirmed severe atrophy and fatty degeneration in the gastrocnemius and soleus muscles.
Findings:
- The cases represent autosomal dominant centronuclear myopathy (ADCNM) with an atypical clinical presentation.
- The distal lower extremity involvement and specific muscle group atrophy expand the recognized phenotype of ADCNM.
- This presentation underscores the diverse clinical manifestations within the centronuclear myopathy spectrum.
Implications:
- The findings broaden the understanding of the clinical heterogeneity of autosomal dominant centronuclear myopathy.
- This expands the differential diagnosis for patients presenting with distal leg weakness and atrophy.
- Highlights the need for genetic evaluation in cases with unusual neuromuscular presentations.
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