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[Polymyositis in childhood].

J Marín¹, F Noguera, A Cabello

¹Unidad de Neurología Infantil, Hospital 12 de Octubre, Madrid, España.

Revista De Neurologia

|June 11, 1999

Summary

Idiopathic inflammatory myopathies, like polymyositis, are rare in children. Steroid treatment can improve symptoms, but outcomes vary, especially in infantile cases.

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Area of Science:

Pediatric Rheumatology
Neuromuscular Disorders

Background:

Idiopathic inflammatory myopathies (IIMs) are rare in infancy, presenting diagnostic challenges.
Polymyositis in children exhibits significant clinical variability.

Observation:

Five pediatric cases of polymyositis were analyzed.
Two distinct groups emerged: infantile polymyositis (generalized hypotonia) and childhood polymyositis (proximal weakness).
Elevated CPK, myopathic EMG, and inflammatory myopathy on biopsy were consistent findings.

Findings:

Infantile polymyositis presents with generalized hypotonia.
Childhood polymyositis mirrors adult presentations, with one case developing juvenile chronic arthritis.
Corticosteroid treatment generally led to clinical improvement, though outcomes were variable and sometimes partial.

Implications:

Polymyositis is exceptionally rare before puberty, with a wide clinical spectrum.
Early diagnosis and treatment are crucial for managing pediatric polymyositis.
While corticosteroids are beneficial, their efficacy may be less favorable compared to dermatomyositis.

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