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Related Experiment Videos

Focal myositis: a clinicopathological study

C J Caldwell1, M Swash, J D Van der Walt

  • 1Department of Morbid Anatomy, London Hospital Medical College, UK.

Neuromuscular Disorders : NMD
|July 1, 1995
PubMed
Summary

Focal myositis, a rare benign condition, can mimic soft tissue sarcoma. This study details two cases, revealing a T-lymphocyte and macrophage infiltrate distinct from polymyositis.

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Area of Science:

  • Pathology
  • Immunology
  • Oncology

Background:

  • Focal myositis is a rare, benign inflammatory condition.
  • It can clinically mimic soft tissue sarcoma.
  • Approximately 30 cases have been reported since 1977.

Observation:

  • Two new cases of focal myositis were analyzed using immunocytochemistry and electron microscopy.
  • Histology revealed a destructive inflammatory myopathy with regeneration.
  • Micro-organism stains and electron microscopy for viral particles were negative.

Findings:

  • Immunocytochemistry showed a cellular infiltrate of T-lymphocytes and macrophages.
  • T-cells were predominantly CD4+.
  • MHC class 1 and 2 antigen expression on inflammatory cells was occasional.

Implications:

  • The findings differentiate focal myositis from polymyositis.
  • Understanding the immunophenotype aids in differential diagnosis.
  • Further clinicopathological correlations are discussed for accurate diagnosis.

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