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Immunoglobulin G4 (IgG4) Positive Associated Liver Disease
Insights
Diagnosis of IgG4-related disease (IgG4-RD) requires combining histopathology, serum IgG4 levels, and clinical findings. Short-term steroid therapy can aid diagnosis in suspected cases.
Area of Science:
- Immunology
- Pathology
- Rheumatology
Background:
- Investigating the diagnostic and treatment strategies for IgG4-related disease (IgG4-RD) predominantly affecting lymph nodes.
- Understanding the complexities in differentiating IgG4-RD from other conditions like lymphoma.
Observation:
- A patient presented with symptoms suggestive of lymphoma, but lymph node biopsy revealed reactive hyperplasia.
- Abnormal liver function tests and atypical lymphocytes in bone marrow were noted.
- Histopathology confirmed elevated IgG4-positive plasma cells (>100/HPF, IgG4/IgG ratio >40%) and a markedly high serum IgG4 level (17,200 mg/L).
Findings:
- The patient was diagnosed with IgG4-related disease based on comprehensive evaluation.
- Treatment with oral glucocorticoids resulted in significant improvement within two weeks, with no lymph node enlargement.
- Histopathology remains the gold standard, but a multi-faceted diagnostic approach is crucial.
Implications:
- Emphasizes the need for integrated diagnosis combining clinical, serological, imaging, and histopathological data for IgG4-RD.
- Highlights the potential utility of a short-term diagnostic hormonal therapy for highly suspected IgG4-RD cases.
- Stresses the importance of standardized treatment, regular follow-up, and monitoring for adverse effects to prevent recurrence and complications.
Background:
The goal was to explore the cognition of diagnosis and treatment level of IgG4-related diseases mainly involving lymph nodes.
Methods:
The clinical manifestations, laboratory indicators, histopathology, and therapeutic effects of a patient with IgG4-RD suspected of lymphoma were analyzed and the relevant literature was reviewed.
Results:
Lymph node biopsy showed reactive hyperplasia of lymph node tissue. The liver biochemical indexes were abnormal and the bone marrow smear showed atypical lymphocytes. Lymph node section: IgG4+ cells > 100/HPF (IgG4/IgG > 40%). The serum IgG4 level was 17,200 mg/L, and the diagnosis was IgG4-RD. Oral glucocorticoids took effect after 2 weeks, and no significant enlargement of lymph nodes was observed.
Conclusions:
For the diagnosis of IgG4-RD, at present, histopathology is still the gold standard, but a single result cannot diagnose the disease. Comprehensive judgment should be made by combining clinical symptoms, serum IgG4 level and imaging results to prevent misdiagnosis and missed diagnosis, and to avoid over-diagnosis. Short-term hormonal diagnostic therapy may be used in highly suspected patients who cannot be diagnosed. Once diagnosed, standardized medication, adhere to follow-up, regular review, to prevent recurrence and adverse drug reactions.
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