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Progressive juvenile segmental spinal muscular atrophy

G T Liu1, L A Specht

  • 1Department of Neurology, Children's Hospital, Boston, MA 02115.

Pediatric Neurology
|January 1, 1993
PubMed
Summary

Juvenile segmental spinal muscular atrophy (JSSMA) can progress beyond the upper limbs to affect lower extremities and cause hyperreflexia. This suggests JSSMA may represent a spectrum between spinal muscular atrophy and amyotrophic lateral sclerosis.

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Area of Science:

  • Neurology
  • Genetics
  • Clinical Medicine

Background:

  • Juvenile segmental spinal muscular atrophy (JSSMA) typically presents with distal upper extremity weakness and follows a benign, self-limiting course.
  • JSSMA is characterized by localized anterior horn cell dysfunction without sensory loss.

Observation:

  • Two adolescent males presented with symptoms consistent with JSSMA, including distal upper extremity atrophy and weakness.
  • These patients later developed progressive lower extremity involvement and hyperreflexia, deviating from the typical JSSMA presentation.

Findings:

  • Electromyography and muscle biopsy confirmed anterior horn cell dysfunction in both patients.
  • The progression to lower limb involvement and hyperreflexia indicates a more severe or atypical form of JSSMA.

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  • Absence of sensory loss was noted in both cases.

    • Implications:

    • This case series expands the known clinical spectrum of JSSMA.
    • It suggests that some JSSMA cases may progress to involve lower limbs years after initial presentation.
    • These findings support classifying progressive JSSMA within the spectrum of motor neuron diseases, bridging spinal muscular atrophy and amyotrophic lateral sclerosis.