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[Neuromuscular choristoma].

I Vajtai1, Z Varga, J Hackel

  • 1Neuro-Oncology Research Laboratory, Barrow Neurological Institute, Phoenix, Arizona, USA.

Orvosi Hetilap
|August 27, 1999
PubMed
Summary
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Neuromuscular choristomas are rare malformations of muscle and nerve tissue, typically affecting infants. This case highlights a neuromuscular choristoma within a lumbosacral lipoma, offering insights into its developmental origins.

Area of Science:

  • Pediatric Pathology
  • Developmental Biology
  • Neuropathology

Background:

  • Neuromuscular choristomas are rare pseudotumoral masses comprising striated muscle and peripheral nerves.
  • This condition predominantly affects large nerve trunks in infants and young children, potentially leading to neurological deficits.
  • These malformations are often associated with congenital anomalies.

Observation:

  • A case of neuromuscular choristoma was identified within a lumbosacral lipoma in a 4-month-old boy.
  • The lesion exhibited an organoid arrangement of myogenic and neurogenic components, resembling neuromuscular units.
  • Histological analysis revealed disordered type-I and type-II extrafusal myofibers and large myelinated axons, with no smooth muscle actin expression.

Findings:

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  • Myosin immunophenotyping confirmed the presence of both type-I and type-II muscle fibers.
  • The composition of the lesion suggests a malformation rather than a true neoplasm.
  • The association with congenital lipoma points towards a potential dysembryogenic origin.

    • Implications:

    • Understanding the pathogenesis of neuromuscular choristomas, including theories of aberrant neural crest cell migration and mesenchymal differentiation.
    • Investigating the role of stem cells from the caudal neural tube in the development of these lesions, particularly when associated with lipomas.
    • This case contributes to the literature on rare pediatric tumors and malformations, aiding in diagnosis and understanding of neurodevelopmental processes.