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IgG4-related disease.

K Hirabayashi1, G Zamboni

  • 1Department of Pathology, Ospedale Sacro Cuore Don Calabria, Negrar (VR), Italy. khira@is.icc.u-tokai.ac.jp

Pathologica
|September 8, 2012
PubMed
Summary
This summary is machine-generated.

Immunoglobulin G4-related disease (IgG4-RD) is a fibro-inflammatory condition often presenting as mass-forming lesions. Diagnosis relies on histopathology and identifying IgG4-infiltrating plasma cells, crucial for appropriate treatment and avoiding surgery.

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Area of Science:

  • Pathology
  • Immunology
  • Rheumatology

Background:

  • Immunoglobulin G4-related disease (IgG4-RD) is a multi-organ fibro-inflammatory condition.
  • It characteristically presents with mass-forming lesions and lymphoplasmacytic infiltrates.
  • IgG4-RD has been identified across diverse organ systems, including the pancreatobiliary tract, salivary glands, kidneys, and lungs.

Purpose of the Study:

  • To review the histopathological features of IgG4-related disease (IgG4-RD) in various organs.
  • To discuss diagnostic criteria, including IgG4+ plasma cell infiltration and serum IgG4 levels.
  • To explore the relationship between IgG4-RD, inflammatory pseudotumors, and malignancy.

Main Methods:

  • Review of histopathological findings in IgG4-related disease (IgG4-RD) across multiple organs.
  • Analysis of diagnostic criteria, emphasizing IgG4+ plasma cell counts and serum IgG4.
  • Discussion of differential diagnosis, including inflammatory pseudotumors and malignancies.

Main Results:

  • Histopathological characteristics and abundant IgG4+ plasma cells are hallmark diagnostic features of IgG4-RD.
  • While variations exist across organs, shared histopathological traits are common.
  • Proposed diagnostic criteria integrate clinical, histopathological, serological, and therapeutic response elements.

Conclusions:

  • Accurate histopathological diagnosis of IgG4-RD is critical for effective management.
  • Identification of IgG4-RD avoids potentially unnecessary major surgical interventions.
  • Timely initiation of corticosteroid therapy is essential for patients with IgG4-RD.