Riedel thyroiditis


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  • Names

    • Riedel thyroiditis
    • ligneous thyroiditis

  • Clinical

    • rare
    • female predominance (5:1)
    • acellular FNA

  • Associations

    • fibrosclerosis
      • mediastinal fibrosis
      • retroperitoneal fibrosis
      • sclerosing cholangitis
    • IgG4

  • Gross

    • white, fibrotic, woody cut surface

  • Histology

    • extensive fibrosis, hyalinization
    • scattered mixed inflammation
    • occlusive phlebitis
    • lack giant cells or germinal centers

  • Ddx

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