<unk> , is a chronic form of thyroiditis. It is now believed that<unk>  is one manifestation of a systemic disease that can affect many organ systems called IgG4-related disease. It is often a multi-organ disease affecting pancreas, liver, kidney, salivary and orbital tissues and retroperitoneum. The hallmarks of the disease are fibrosis and infiltration by IgG4 secreting plasma cells.
Riedel's thyroiditis
Ord's thyroiditis
De Quervain's thyroiditis
Hashimoto's thyroiditis
Radiation-induced thyroiditis
Subacute thyroiditis
Subacute lymphocytic thyroiditis
Autoimmune thyroiditis