Abstract
Riedel’s thyroiditis (RT), is a rare form of multifocal fibrosis of the thyroid gland. Typical histopathology of Riedel’s thyroiditis has been described to show atrophy and inflammation of the thyroid parenchyma with dense fibrosis extending in the adjacent tissue. IgG4-related disease is a newly recognized fibroinflammatory condition characterized by fibrotic lesions at multiple sites, a dense lymphoplasmacytic infiltrate rich in IgG4-positive plasma cells, storiform fibrosis, and often but not necessarily, elevated serum IgG4 concentrations.
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