{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T12:10:24Z","timestamp":1780920624681,"version":"3.54.1"},"reference-count":17,"publisher":"BMJ","issue":"6","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2026,5,26]]},"published-print":{"date-parts":[[2026,6]]},"abstract":"<jats:p>Riedel\u2019s thyroiditis is an extremely rare fibrosing inflammatory disorder that extends beyond the thyroid capsule into surrounding structures. The disease usually progresses slowly; however, we report an unusual case with rapid progression that closely mimicked malignancy.<\/jats:p>\n                  <jats:p>An Asian woman in her 50s developed throat discomfort, hoarseness and a neck mass within 1\u2009month. Laryngoscopy revealed left vocal cord paresis. Ultrasonography demonstrated a rapidly enlarging hypoechoic mass and fine-needle aspiration cytology suggested possible malignancy. Total thyroidectomy with lymph node dissection was, therefore, performed. Histopathological examination revealed dense fibrosis and obliterative phlebitis, consistent with Riedel's thyroiditis. The patient\u2019s hoarseness improved postoperatively, and she remains well 2.5 years later on levothyroxine monotherapy.<\/jats:p>\n                  <jats:p>This case illustrates that Riedel\u2019s thyroiditis can rarely present with acute progression and recurrent laryngeal nerve palsy, closely mimicking thyroid cancer. Early surgical intervention provided both a definitive diagnosis and effective treatment.<\/jats:p>","DOI":"10.1136\/bcr-2025-270858","type":"journal-article","created":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T11:40:15Z","timestamp":1780918815000},"page":"e270858","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Rapidly progressive Riedel\u2019s thyroiditis presenting with recurrent laryngeal nerve palsy mimicking thyroid malignancy"],"prefix":"10.1136","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-5860-1669","authenticated-orcid":false,"given":"AI","family":"Yanai","sequence":"first","affiliation":[{"name":"Department of Surgery, Sendai City Hospital, Sendai, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-7417-5866","authenticated-orcid":false,"given":"Makoto","family":"Horiuchi","sequence":"additional","affiliation":[{"name":"Department of Surgery, Sendai City Hospital, Sendai, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-9019-3202","authenticated-orcid":false,"given":"Yoshihiro","family":"Kaiwa","sequence":"additional","affiliation":[{"name":"Department of Surgery, Sendai City Hospital, Sendai, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-9916-1515","authenticated-orcid":false,"given":"Rie","family":"Shibuya","sequence":"additional","affiliation":[{"name":"Pathology, Sendai City Hospital, Sendai, Miyagi Prefecture, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-5081-0583","authenticated-orcid":false,"given":"Kaori","family":"Fukuda","sequence":"additional","affiliation":[{"name":"Department of Surgery, Sendai City Hospital, Sendai, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,6,8]]},"reference":[{"key":"2026060804401050000_19.6.e270858.1","first-page":"S50","article-title":"Current Concepts on Riedel Thyroiditis","volume":"121","author":"Papi","year":"2004","journal-title":"Am J Clin Pathol"},{"key":"2026060804401050000_19.6.e270858.2","doi-asserted-by":"crossref","DOI":"10.1155\/2009\/535974","article-title":"A Case of Concurrent Riedel\u2019s, Hashimoto\u2019s and Acute Suppurative Thyroiditis","volume":"2009","author":"Pirola","year":"2009","journal-title":"Case Rep Med"},{"key":"2026060804401050000_19.6.e270858.3","doi-asserted-by":"crossref","first-page":"1851","DOI":"10.1007\/s00296-011-2004-x","article-title":"Subclinical Riedel\u2019s thyroiditis with hypothyroidism coexisting with Mikulicz\u2019s disease","volume":"32","author":"Nagashima","year":"2012","journal-title":"Rheumatol Int"},{"key":"2026060804401050000_19.6.e270858.4","doi-asserted-by":"crossref","first-page":"1312","DOI":"10.1002\/acr.20215","article-title":"Riedel\u2019s thyroiditis and multifocal fibrosclerosis are part of the IgG4-related systemic disease spectrum","volume":"62","author":"Dahlgren","year":"2010","journal-title":"Arthritis Care Res (Hoboken)"},{"key":"2026060804401050000_19.6.e270858.5","first-page":"e343","article-title":"The current status of lymph node dissection in the treatment of papillary thyroid cancer. A literature review","volume":"164","author":"Conzo","year":"2013","journal-title":"Clin Ter"},{"key":"2026060804401050000_19.6.e270858.6","doi-asserted-by":"crossref","first-page":"3031","DOI":"10.1210\/jc.2011-0617","article-title":"Riedel\u2019s Thyroiditis: A Clinical Review","volume":"96","author":"Hennessey","year":"2011","journal-title":"The Journal of Clinical Endocrinology & Metabolism"},{"key":"2026060804401050000_19.6.e270858.7","doi-asserted-by":"crossref","DOI":"10.1186\/s12885-019-6348-z","article-title":"Growth rates of malignant and benign thyroid nodules in an ultrasound follow-up study: a retrospective cohort study","volume":"19","author":"Cordes","year":"2019","journal-title":"BMC Cancer"},{"key":"2026060804401050000_19.6.e270858.8","doi-asserted-by":"publisher","DOI":"10.1089\/thy.2010.0453"},{"key":"2026060804401050000_19.6.e270858.9","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1210\/jcem-17-2-201","article-title":"Invasive fibrous thyroiditis (Riedel\u2019s struma)","volume":"17","author":"BEAHRS","year":"1957","journal-title":"J Clin Endocrinol Metab"},{"key":"2026060804401050000_19.6.e270858.10","doi-asserted-by":"publisher","DOI":"10.1007\/BF00507134"},{"key":"2026060804401050000_19.6.e270858.11","doi-asserted-by":"publisher","DOI":"10.1093\/ajcp\/90.6.715"},{"key":"2026060804401050000_19.6.e270858.12","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2559.1983.tb02286.x"},{"key":"2026060804401050000_19.6.e270858.13","unstructured":"Majety P , Hennessey JV , et al . Acute and subacute, and riedel\u2019s thyroiditis. In: Feingold KR , Anawalt B , Boyce A , eds. Endotext. South Dartmouth, MA: MDText.com, Inc, 2000."},{"key":"2026060804401050000_19.6.e270858.14","doi-asserted-by":"crossref","unstructured":"Guia Lopes ML , Cidade JP , Cunha C , et al . Life-threatening airway obstruction by Riedel\u2019s thyroiditis: a rare presentation and diagnostic dilemma. J Cosmet Laser Ther 2024;2024. doi:10.1530\/EDM-24-0053","DOI":"10.1530\/EDM-24-0053"},{"key":"2026060804401050000_19.6.e270858.15","doi-asserted-by":"publisher","DOI":"10.1016\/S0039-6060(96)80045-6"},{"key":"2026060804401050000_19.6.e270858.16","doi-asserted-by":"crossref","first-page":"e3469","DOI":"10.1210\/clinem\/dgaa468","article-title":"Riedel thyroiditis","volume":"105","author":"Zala","year":"2020","journal-title":"J Clin Endocrinol Metab"},{"key":"2026060804401050000_19.6.e270858.17","unstructured":"Gambardella C , et al . Transcutaneous Laryngeal Ultrasonography for Vocal Cord Assessment after Thyroid Surgery. Updates Surg 2020."}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2025-270858","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T11:40:20Z","timestamp":1780918820000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2025-270858"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,6]]},"references-count":17,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2026,6,8]]},"published-print":{"date-parts":[[2026,6]]}},"alternative-id":["10.1136\/bcr-2025-270858"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2025-270858","relation":{},"ISSN":["1757-790X"],"issn-type":[{"value":"1757-790X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,6]]}}}