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Urticarial vasculitis.

P A Cardoso1, Z P de Oliveira, V A Alves

  • 1Dermatology Department, São Paulo University, Brazil.

Allergologia Et Immunopathologia
|July 1, 1990
PubMed
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Histopathology is key for diagnosing urticarial vasculitis, distinguishing it from chronic urticaria. Some patients present with vasculitis, suggesting a spectrum of disease.

Area of Science:

  • Dermatology
  • Immunology
  • Pathology

Background:

  • Chronic urticaria is a common condition.
  • Urticarial vasculitis (UV) is a distinct entity that can mimic chronic urticaria.
  • Understanding the diagnostic differences is crucial for appropriate management.

Purpose of the Study:

  • To investigate the diagnostic features of urticarial vasculitis.
  • To compare laboratory and histological findings in patients with chronic urticaria and urticarial vasculitis.
  • To explore the relationship between chronic urticaria and urticarial vasculitis.

Main Methods:

  • Prospective study of 37 chronic urticaria patients.
  • Inclusion of regular and immunological laboratory tests.
  • Histologic analysis, direct immunofluorescence, and immunohistochemistry of skin biopsies.

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Main Results:

  • Vasculitis identified in 27% of patients.
  • Urticarial vasculitis patients often presented with only urticarial lesions, with some showing residual macules or angioedema.
  • Elevated serum immunoglobulins and immune complexes were noted in both groups; complement reduction was observed in 55% of UV patients.
  • Immunohistochemistry showed immunoglobulin deposition in vessel walls in only 10% of UV patients.

Conclusions:

  • Conventional histopathology is the primary diagnostic method for urticarial vasculitis.
  • Direct immunofluorescence and immunoperoxidase are valuable ancillary tools.
  • A spectrum likely exists between common urticaria and systemic urticarial vasculitis.