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Microscopic polyangiitis. A systemic vasculitis with a positive P-ANCA

P F Peñas1, J I Porras, J Fraga

  • 1Department of Dermatology, Hospital Universitario de la Princesa, Madrid, Spain.

The British Journal of Dermatology
|March 1, 1996
PubMed
Summary
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This case study highlights a rare diagnosis of microscopic polyangiitis in a young girl, characterized by a purpuric rash and kidney damage. Early, aggressive treatment led to a positive clinical response and stabilization of renal function.

Area of Science:

  • Nephrology
  • Rheumatology
  • Dermatology

Background:

  • Microscopic polyangiitis (MPA) is a rare systemic vasculitis affecting small blood vessels.
  • MPA typically presents with glomerulonephritis and various extrarenal manifestations.
  • Early diagnosis and aggressive immunosuppressive therapy are crucial for favorable outcomes.

Observation:

  • A young female patient presented with a purpuric rash, fever, eosinophilia, peripheral neuropathy, and progressive renal insufficiency.
  • Skin lesions included vesicles, purpuric macules/papules, nodules, splinter hemorrhages, and facial edema.
  • Renal biopsy revealed focal and segmental necrotizing glomerulonephritis with crescents.

Findings:

  • Anti-neutrophil cytoplasmic antibodies (ANCA) testing was positive for antimyeloperoxidase (MPO) specificity (P-ANCA (MPO)) and negative for PR3 specificity.

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  • The patient fulfilled diagnostic criteria for MPA, including glomerulonephritis and extrarenal small-vessel vasculitis without granulomas or asthma.
  • Treatment with prednisone and cyclophosphamide resulted in clinical improvement, stabilized renal insufficiency, and P-ANCA (MPO) disappearance.

    • Implications:

    • This case underscores the importance of considering MPA in young patients with unexplained renal insufficiency and systemic symptoms.
    • The dermatological manifestations can be diverse, requiring a multidisciplinary approach for diagnosis.
    • Prompt and aggressive immunosuppressive treatment is vital for managing MPA and preventing irreversible organ damage.