Immunoglobulin G4-related Disease

Area of Science:

• Rheumatology
• Pulmonology
• Pathology

Background:

• Immunoglobulin G4 (IgG4)-Related Disease (IgG4-RD) is a multisystem fibroinflammatory condition.
• It can impact nearly any organ, leading to dysfunction and irreversible damage.
• Commonly affected sites include salivary glands, lacrimal glands, pancreas, and frequently the chest.

Purpose of the Study:

• To highlight the diverse thoracic manifestations of IgG4-Related Disease.
• To emphasize the diagnostic challenges and the role of pulmonary lesion biopsy.
• To outline the primary treatment strategies for IgG4-RD.

Main Methods:

• Review of clinical and pathological findings in IgG4-RD patients with thoracic involvement.
• Analysis of diagnostic criteria and differentiating features from other conditions.
• Evaluation of treatment outcomes with immunosuppressive therapies.

Main Results:

• Thoracic manifestations of IgG4-RD include lung nodules, consolidations, pleural thickening, aortitis, and lymphadenopathy.
• Diagnosis relies on clinicopathologic correlation due to lack of a single definitive test.
• Pulmonary biopsy is valuable for distinguishing IgG4-RD from mimics.

Conclusions:

• IgG4-RD presents with varied thoracic pathology, necessitating high clinical suspicion.
• Accurate diagnosis requires integrating clinical, imaging, and pathological data.
• Glucocorticoids and steroid-sparing agents are the mainstay of IgG4-RD treatment.