Journal of Korean Endocrine Society 2003;18(4):414-419.
Published online August 1, 2003.
A Case of Riedel's Thyroiditis in a Patient with a History of Subacute Thyroiditis.
Chul Sik Kim, Sung Ju Lee, Jong Suk Park, Joo Young Nam, Dol Mi Kim, Chul Woo Ahn, Bong Soo Cha, Sung Kil Lim, Kyung Rae Kim, Hyun Chul Lee
Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
Riedel's thyroiditis is a rare form of chronic thyroiditis, characterized by a fibroinflammatory process which partially destroys the thyroid, often involving surrounding tissues. The relationship of Riedel's thyroiditis to other forms of thyroiditis is not clear. A case of Riedel's thyroiditis in a 51-year-old female patient, admitted with a previous diagnosis of subacute thyroiditis, is reported. She was first diagnosed with subacute thyroiditis based on clinical manifestation and radiologic and laboratory results. She was treated with glucocorticoid for 8 weeks. The follow-up lasted for 12 months. However, three years later she underwent a thyroidectomy operation due to an enlargement of the thyroid nodule and suspicion of malignancy. Histopathologic examination confirmed that she had Riedel's Thyroiditis. Until now, few case of Riedel's thyroiditis in patients with a history of subacute thyroiditis have been reported in the literature. Although the etiology of Riedel's thyroiditis is unknown, it may develop in the course of subacute thyroiditis.
Key Words: Riedel's Thyroiditis, Invasive Fibrosing Thyroiditis, Subacute Thyroiditis, Hyperthyroidism

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