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[MICROSCOPIC POLYANGIITIS WITH VARIABLE PRESENTATION].

Maria Karlinskaya1, Lyudmila Vaysman1, Emma Lerner1

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Summary
This summary is machine-generated.

Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis, including microscopic polyangiitis (MPA), presents diverse clinical symptoms. This case series highlights varied patient outcomes and treatment challenges in managing MPA, emphasizing the need for timely diagnosis and appropriate care.

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Area of Science:

  • Nephrology
  • Rheumatology
  • Pulmonology
  • Immunology

Background:

  • Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis encompasses rare systemic necrotizing diseases affecting small to medium-sized vessels.
  • Microscopic polyangiitis (MPA), a form of ANCA-associated vasculitis, involves multiple organ systems, leading to varied clinical presentations.
  • Early diagnosis and management are crucial for improving outcomes in ANCA-associated vasculitis.

Purpose of the Study:

  • To present three distinct cases of microscopic polyangiitis (MPA) managed within a single department over four years.
  • To illustrate the diverse clinical manifestations and diagnostic challenges associated with MPA.
  • To highlight the impact of treatment adherence and potential complications in MPA patients.

Main Methods:

  • Retrospective case series analysis of three patients diagnosed with microscopic polyangiitis (MPA).
  • Review of clinical presentations, diagnostic workups, treatment regimens, and patient outcomes.
  • Analysis of factors contributing to treatment success and therapeutic failure.

Main Results:

  • Case 1: Presented with idiopathic pulmonary fibrosis-like symptoms, diagnosed with MPA upon renal failure onset; patient succumbed to pulmonary infection despite initial renal recovery.
  • Case 2: Exhibited constitutional symptoms, diagnosed with MPA after developing mononeuritis multiplex; patient responded well to treatment.
  • Case 3: Presented with end-stage renal failure, treated with cyclophosphamide and rituximab; patient died from *Pneumocystis jirovecii* pneumonia due to non-adherence to cotrimoxazole prophylaxis.

Conclusions:

  • Microscopic polyangiitis (MPA) can mimic other conditions, necessitating a high index of suspicion for timely diagnosis.
  • Patient outcomes in MPA are influenced by factors including the extent of organ involvement, promptness of diagnosis, and adherence to prophylactic treatments.
  • Effective management of MPA requires a multidisciplinary approach and vigilant monitoring for complications such as infections.