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Polyarteritis nodosa presenting as polymyositis.

Spencer G Plumley1, Ronald Rubio, Said Alasfar

  • 1Division of Rheumatology and Clinical Immunology, Department of Internal Medicine, University of Arkansas for Medical Sciences and Veterans Administration Hospital, Little Rock, AR 72205, USA.

Seminars in Arthritis and Rheumatism
|June 22, 2002
PubMed
Summary

Polyarteritis nodosa (PAN) can rarely present as polymyositis, characterized by muscle weakness and elevated creatine kinase. Early diagnosis through muscle biopsy is crucial for timely PAN treatment.

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Area of Science:

  • Rheumatology
  • Neurology
  • Pathology

Background:

  • Skeletal muscle involvement is common in Polyarteritis Nodosa (PAN), but polymyositis is an uncommon presentation.
  • This study highlights a rare case of PAN mimicking polymyositis.

Observation:

  • A 24-year-old male presented with fever, myalgia, and muscle weakness.
  • Muscle biopsy revealed necrotizing vasculitis consistent with PAN.
  • Elevated serum creatinine phosphokinase and diffuse myopathy were noted.

Findings:

  • Literature review confirms frequent muscle involvement in PAN (19% myopathy, 30-48% autopsy skeletal muscle involvement).
  • Only one prior case of PAN presenting with polymyositis-like symptoms (elevated CK, diffuse myopathy) was found.
  • This case represents the second documented instance of polymyositis as an initial presentation of PAN.

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Implications:

  • PAN should be considered in patients with myopathy, particularly those with systemic disease.
  • Muscle biopsy or EMG-directed biopsy can aid in diagnosing PAN, enabling prompt treatment.
  • Recognizing this rare presentation can improve patient outcomes by facilitating early intervention.