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Early onset distal muscular dystrophy

H Kinoshita1, K Sugai, Y Goto

  • 1Department of Child Neurology, National Center Hospital for Mental, Nervous and Muscular Disorders, National Center of Neurology and Psychiatry (NCNP) Tokyo, Japan.

Brain & Development
|May 1, 1995
PubMed
Summary

This study reports a rare case of distal muscular dystrophy in a 14-year-old boy with early-onset lower limb weakness. The findings suggest a potential new subtype or variant of known distal muscular dystrophies.

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Area of Science:

  • Neurology
  • Genetics
  • Muscle Diseases

Background:

  • Distal muscular dystrophies are a group of inherited muscle disorders characterized by progressive weakness and atrophy primarily affecting the distal muscles.
  • Early-onset forms are less common and often present diagnostic challenges.

Observation:

  • A 14-year-old Chinese male presented with progressive muscle weakness and atrophy in the lower limbs starting at age 6.
  • Clinical examination revealed reduced ankle dorsiflexion, toe-walking, and preferential anterior tibial muscle involvement.
  • Elevated serum creatine kinase (905 IU/l) and muscle CT showing low density areas were noted.

Findings:

  • Muscle biopsy of the biceps brachii showed mild dystrophic changes.
  • The patient was diagnosed with distal muscular dystrophy but did not fit previously described classifications.

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  • Symptoms resembled tibial muscular dystrophy but with a significantly earlier onset.

    • Implications:

    • This case may represent a novel form of distal muscular dystrophy or a variant of Miyoshi or tibial muscular dystrophy.
    • Further research, including genetic analysis, is needed to clarify the classification and underlying mechanisms.
    • Understanding this case can contribute to the broader knowledge of muscular dystrophy spectrum and diagnosis.