title: Riedel's thyroiditis in a patient with recurrent subacute thyroiditis: a case report and review of the literature.
abstract: Riedel's thyroiditis is a rare form of chronic thyroiditis, characterised by a fibroinflammatory process that partially destroys the thyroid and often involves 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 woman presenting with symptoms of subacute thyroiditis, is reported. She was diagnosed with subacute thyroiditis based on clinical manifestation and laboratory results. She was treated with glucocorticoids for six weeks, and then followed-up for 12 months. Three years later, she visited with tenderness and enlargement of thyroid mass, and laboratory and radiology findings suggested that she had a malignant thyroid tumor as well as subacute thyroiditis. After thyroidectomy, histopathologic findings showed that she had Riedel's thyroiditis in the presence of subacute thyroiditis. Until now, few cases 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.
authors.affiliation: Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Min Ho
authors.initials: MH
authors.lastname: Cho
authors.forename: Chul Sik
authors.initials: CS
authors.lastname: Kim
authors.forename: Jong Suk
authors.initials: JS
authors.lastname: Park
authors.forename: Eun Seok
authors.initials: ES
authors.lastname: Kang
authors.forename: Chul Woo
authors.initials: CW
authors.lastname: Ahn
authors.forename: Bong Soo
authors.initials: BS
authors.lastname: Cha
authors.forename: Sung Kil
authors.initials: SK
authors.lastname: Lim
authors.forename: Kyung Rae
authors.initials: KR
authors.lastname: Kim
authors.forename: Hyun Chul
authors.initials: HC
authors.lastname: Lee
mesh_terms: D005260:Female; D006801:Humans; D008875:Middle Aged; D012008:Recurrence; D013670:Sodium Pertechnetate Tc 99m; D013965:Thyroidectomy; D013968:Thyroiditis, Subacute / Q000175:diagnosis* / Q000276:immunology / Q000601:surgery
chemical_list: D013670:Sodium Pertechnetate Tc 99m