Riedel's thyroiditis pathophysiology: Difference between revisions
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Image:Riedel's.jpg|center|thumb|250px|'''Histology of Riedel's thyroiditis''' | Image:Riedel's.jpg|center|thumb|250px|'''Histology of Riedel's thyroiditis''' | ||
==References== | ==References== | ||
Revision as of 13:24, 23 August 2017
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Furqan M M. M.B.B.S[2]
Overview
The exact pathogenesis of Riedel's thyroiditis is not fully understood. The presence of thyroid autoantibodies and lymphoid infiltration of the thyroid gland resembling that of Hashimoto's thyroiditis might indicate an autoimmune etiology. It is considered that the infiltrating lymphocytes release cytokines which are responsible for the activation of fibroblasts responsible for the fibrosis. Riedel's thyroiditis 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 and fixed to adjacent structures. A shared mechanism with retroperitoneal fibrosis and sclerosing cholangitis has been suggested.
Pathophysiology
Pathogenesis
The exact pathogenesis of Riedel's thyroiditis is not fully understood. The presence of thyroid autoantibodies and lymphoid infiltration of the thyroid gland resembling that of Hashimoto's thyroiditis might indicate an autoimmune etiology.
- It is considered that the infiltrating lymphocytes release cytokines which are responsible for the activation of fibroblasts responsible for the fibrosis.[1]
- Riedel's thyroiditis 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 and fixed to adjacent structures.[2]
- Tissue eosinophilia and Major basic protein (MBP) identified in the thyroid gland on the histopathological analysis are also thought to play a role in the proliferation of fibroblasts.[3]
- A shared mechanism with retroperitoneal fibrosis and sclerosing cholangitis is also suggested.[4]
Associated Conditions
Riedel's thyroiditis is associated various other autoimmune conditions including:[1][5][6][7][8]
- Graves’ disease
- Hashimoto’s thyroiditis
- Multifocal idiopathic fibrosclerosis
- Addison’s disease
- Pernicious anemia
- Type 1 diabetes
Gross Pathology
- On gross pathology, dense, avascular white fibrous tissue, the absence of a capsule, and no normal thyroid tissue are characteristic findings of Riedel's thyroiditis.[9]
Microscopic Pathology
- On microscopic histopathological analysis, destruction of thyroid follicle by inflammatory cells and fibrous tissues and invasion of surrounding structures are characteristic findings of Riedel's thyroiditis.The inflammatory cells including lymphocytes, plasma cells, and eosinophils are present in a dense matrix of hyalinized connective tissue.[10][11]
Image:Riedel's.jpg|center|thumb|250px|Histology of Riedel's thyroiditis
References
- ↑ 1.0 1.1 Zimmermann-Belsing T, Feldt-Rasmussen U (1994). "Riedel's thyroiditis: an autoimmune or primary fibrotic disease?". J. Intern. Med. 235 (3): 271–4. PMID 8120524.
- ↑ Cho MH, Kim CS, Park JS; et al. (2007). "Riedel's thyroiditis in a patient with recurrent subacute thyroiditis: a case report and review of the literature". Endocr. J. 54 (4): 559–62. PMID 17603227.
- ↑ "Tissue eosinophilia and eosinophil degranulation in Riedel's invasive fibrous thyroiditis | The Journal of Clinical Endocrinology & Metabolism | Oxford Academic".
- ↑ De Boer WA (1993). "Riedel's thyroiditis, retroperitoneal fibrosis, and sclerosing cholangitis: diseases with one pathogenesis?". Gut. 34 (5): 714. PMC 1374200. PMID 8504980.
- ↑ Drury MI, Sweeney EC, Heffernan SJ (1974). "Invasive fibrous (Riedel's) thyroiditis". Ir Med J. 67 (14): 388–90. PMID 4413980.
- ↑ "Chronic thyroiditis: A case showing features of both riedel's and hashimoto's thyroiditis - Merrington - 1948 - British Journal of Surgery - Wiley Online Library".
- ↑ Hines RC, Scheuermann HA, Royster HP (1970). "Invasive Fibrous (Riedel's) Thyroiditis With Bilateral Fibrous Parotitis". JAMA: 869–871. doi:10.1001/jama.1970.03170310147054.
- ↑ "Riedel's Thyroiditis: A Clinical Review | The Journal of Clinical Endocrinology & Metabolism | Oxford Academic".
- ↑ "Riedel's Thyroiditis | American Journal of Clinical Pathology | Oxford Academic".
- ↑ "Redirecting".
- ↑ Papi G, LiVolsi VA (2004). "Current concepts on Riedel thyroiditis". Am. J. Clin. Pathol. 121 Suppl: S50–63. PMID 15298150.