NCIt synonyms : Riedel's Fibrosing Thyroiditis; Riedel s Fibrosing Thyroiditis;
NCIt related terms : Riedel Thyroiditis;
NCIt definition : An inflammatory disorder of unknown etiology that affects the thyroid gland. It is
characterized by extensive fibrosis of the thyroid parenchyma. The fibrosis extends
beyond the thyroid gland capsule to the adjacent structures.;
Alternative definition : NICHD: Thyroiditis of unknown etiology, characterized by extensive fibrosis of the
thyroid parenchyma. The fibrosis extends beyond the thyroid gland capsule to the adjacent
structures.;