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IgG4-related disease (IgG4-RD) is a rare systemic, immune-mediated disorder that can affect many organ systems including the pancreas, kidneys, lungs, and vasculature. The coexistence of granulomas and giant cells in the presence of IgG4-RD raises suspicion for various vasculitides.1
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Gener et al. (2025) studied this question.
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