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Microscopic polyarteritis presenting with chest infections and acute appendicitis.

P K Li1, F M Lai, G T Ko

  • 1Department of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin.

Australian and New Zealand Journal of Medicine
|February 1, 1992
PubMed
Summary

This case study highlights antineutrophil cytoplasmic auto-antibody (ANCA) positive microscopic polyarteritis, a rare condition with diverse symptoms including lung and kidney issues. Prompt treatment involving plasma exchange and cyclophosphamide is crucial for managing this ANCA-associated vasculitis.

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Area of Science:

  • Nephrology
  • Rheumatology
  • Pathology

Background:

  • Microscopic polyarteritis is a rare systemic vasculitis associated with antineutrophil cytoplasmic auto-antibodies (ANCA).
  • ANCA-associated vasculitis typically affects small blood vessels, leading to diverse organ damage.
  • Understanding the varied clinical presentations is key for timely diagnosis and effective management.

Observation:

  • A 38-year-old male presented with recurrent chest infections, pulmonary hemorrhage, renal insufficiency, and acute appendicitis.
  • Appendectomy revealed vasculitis of serosal vessels, and renal biopsy showed focal necrotizing glomerulonephritis without immune deposits.
  • Initial antibiotic treatment for chest infections provided only partial relief, with relapse occurring.

Findings:

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  • Complete resolution of pulmonary symptoms was achieved after plasma exchange and cyclophosphamide treatment.
  • The case demonstrates the protean manifestations of ANCA-positive microscopic polyarteritis.
  • A strong correlation between ANCA levels and disease activity was observed.

    • Implications:

    • This case underscores the importance of considering ANCA-associated vasculitis in patients with unexplained multi-organ involvement.
    • Aggressive immunosuppressive therapy, including plasma exchange and cyclophosphamide, is effective in managing severe manifestations.
    • Further research into the pathogenesis and treatment of microscopic polyarteritis is warranted.