<unk>  is characterized by a replacement of the normal thyroid parenchyma by a dense fibrosis that invades adjacent structures of the neck and extends beyond the thyroid capsule. This makes the thyroid gland stone-hard (woody) and fixed to adjacent structures. The inflammatory process infiltrates muscles and causes symptoms of tracheal compression. Surgical treatment is required to relieve tracheal or esophageal obstruction.
Riedel's thyroiditis
Ord's thyroiditis
De Quervain's thyroiditis
Hashimoto's thyroiditis
Radiation-induced thyroiditis
Subacute thyroiditis
Subacute lymphocytic thyroiditis
Autoimmune thyroiditis