Polymyositis with elevated serum IgG4 levels and abundant IgG4+ plasma cell infiltration: A case report and literature review

Conclusion: Our case indicated that PM could present with high serum IgG4 levels and IgG4+ plasma-cell infiltration, mimicking IgG4-RD. Although the mechanism of IgG4 elevation in such PM is unclear, our case highlights the necessity to recognize that high serum IgG4 levels and IgG4+ plasma-cell infiltration in organs are not specific for IgG4-RD.
Source: Medicine - Category: Internal Medicine Tags: Research Article: Clinical Case Report Source Type: research