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Pediatric monomelic amyotrophy: evidence for poliomyelitis in vulnerable populations

Hugh J McMillan1, Basil T Darras, Peter B Kang

  • 1Department of Neurology, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts, USA.

Muscle & Nerve
|August 1, 2009
PubMed

Insights

Pediatric monomelic amyotrophy is difficult to diagnose, especially in children with limited medical history. This study suggests polio-related viruses as a likely cause for this rare condition.

Area of Science:

  • Neurology
  • Pediatric Neurology
  • Infectious Diseases

Background:

  • Pediatric monomelic amyotrophy (PMA) presents diagnostic challenges, particularly in adopted or immigrant children lacking medical history.
  • Monomelic amyotrophy (PMA) is a rare neuromuscular disorder characterized by muscle wasting in a specific limb.

Purpose of the Study:

  • To investigate the potential causes of pediatric monomelic amyotrophy (PMA) in children with limited medical history.
  • To analyze clinical and electrophysiological findings in pediatric patients with unilateral or asymmetric motor neuronopathy.

Main Methods:

  • Clinical data collection from 11 pediatric patients diagnosed with monomelic amyotrophy (PMA).
  • Electrophysiological studies to assess motor neuron function and identify patterns of neuropathy.
  • Review of medical histories, focusing on potential infectious etiologies.

Main Results:

  • All 11 children exhibited electrophysiological evidence of unilateral or profoundly asymmetric motor neuronopathy.
  • The findings were most consistent with prior infections from wildtype poliovirus, "polio-like" viruses, or vaccine-associated paralytic poliomyelitis.
  • Diagnostic challenges were exacerbated by the lack of comprehensive medical histories in immigrant or adopted children.

Conclusions:

  • Polio-related viral infections are a significant potential cause of pediatric monomelic amyotrophy (PMA).
  • Electrophysiological evidence of asymmetric motor neuronopathy supports a polio-like etiology in these cases.
  • Further investigation is needed to confirm the specific viral agents responsible for PMA in this population.

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