Thyroid adenoma pathophysiology: Difference between revisions
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==Overview== | ==Overview== | ||
Thyroid adenoma arises from the [[epithelial cell]]s of the [[thyroid]] gland, which are normally involved in secretion of [[thyroxine]] hormone. The most common [[gene]] involved in the pathogenesis of thyroid adenoma is ''THADA'' [[gene]]. | [[Thyroid]] [[adenoma]] arises from the [[epithelial cell]]s of the [[thyroid]] gland, which are normally involved in secretion of [[thyroxine]] hormone. The most common [[gene]] involved in the [[pathogenesis]] of thyroid adenoma is ''THADA'' [[gene]]. | ||
==Pathogenesis== | ==Pathogenesis== | ||
Thyroid adenoma are lumps which commonly arise within an otherwise normal [[thyroid|thyroid gland]]. They indicate a [[thyroid]] neoplasm. | [[Thyroid]] [[adenoma]] are lumps which commonly arise within an otherwise normal [[thyroid|thyroid gland]]. They indicate a [[thyroid]] neoplasm. | ||
* Sometimes a thyroid nodule presents as a fluid-filled cavity called a thyroid cyst. Often, solid components are mixed with the fluid. Thyroid cysts most commonly result from degenerating [[thyroid adenoma]]s, which are benign, but they occasionally contain malignant solid components. | * Sometimes a [[thyroid]] [[nodule]] presents as a fluid-filled cavity called a [[thyroid]] cyst. Often, solid components are mixed with the fluid. [[Thyroid]] [[cysts]] most commonly result from degenerating [[thyroid adenoma]]s, which are benign, but they occasionally contain [[malignant]] solid components. | ||
* A thyroid adenoma may be clinically silent, or it may be a "functional" [[tumor]], producing excessive [[thyroid hormone]]. In this case, it may result in symptomatic [[hyperthyroidism]], and may be referred to as a toxic thyroid adenoma. | * A thyroid adenoma may be clinically silent, or it may be a "functional" [[tumor]], producing excessive [[thyroid hormone]]. In this case, it may result in symptomatic [[hyperthyroidism]], and may be referred to as a toxic thyroid adenoma. | ||
===Colloid Nodules=== | ===Colloid Nodules=== | ||
Colloid nodules are non-neoplastic benign nodules occurring within the [[thyroid]] gland. They form the vast majority of nodular thyroid disease. Colloid nodules are composed of irregularly enlarged follicles containing abundant [[colloid]]. Some [[colloid]] nodules can be cystic (cystic colloid nodule), and may contain areas of [[necrosis]], [[hemorrhage]], and [[calcification]]. [[Colloid nodule|Colloid nodules]] may be single or multiple and can vary considerably in size.<ref name="pmid9484634">{{cite journal| author=Zacks JF, de las Morenas A, Beazley RM, O'Brien MJ| title=Fine-needle aspiration cytology diagnosis of colloid nodule versus follicular variant of papillary carcinoma of the thyroid. | journal=Diagn Cytopathol | year= 1998 | volume= 18 | issue= 2 | pages= 87-90 | pmid=9484634 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=9484634 }}</ref> | Colloid [[nodules]] are non-neoplastic benign [[nodules]] occurring within the [[thyroid]] gland. They form the vast majority of nodular thyroid disease. Colloid [[nodules]] are composed of irregularly enlarged follicles containing abundant [[colloid]]. Some [[colloid]] [[nodules]] can be cystic ([[cystic]] colloid [[nodule]]), and may contain areas of [[necrosis]], [[hemorrhage]], and [[calcification]]. [[Colloid nodule|Colloid nodules]] may be single or multiple and can vary considerably in size.<ref name="pmid9484634">{{cite journal| author=Zacks JF, de las Morenas A, Beazley RM, O'Brien MJ| title=Fine-needle aspiration cytology diagnosis of colloid nodule versus follicular variant of papillary carcinoma of the thyroid. | journal=Diagn Cytopathol | year= 1998 | volume= 18 | issue= 2 | pages= 87-90 | pmid=9484634 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=9484634 }}</ref> | ||
==Genetics== | ==Genetics== | ||
* The target [[gene]] associated with thyroid adenoma has been identified and referred to as ''thyroid adenoma associated'' (''THADA'') gene.<ref name="pmid12955091">{{cite journal| author=Rippe V, Drieschner N, Meiboom M, Murua Escobar H, Bonk U, Belge G et al.| title=Identification of a gene rearranged by 2p21 aberrations in thyroid adenomas. | journal=Oncogene | year= 2003 | volume= 22 | issue= 38 | pages= 6111-4 | pmid=12955091 | doi=10.1038/sj.onc.1206867 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12955091 }} </ref><ref name="KlothBelge2011">{{cite journal|last1=Kloth|first1=Lars|last2=Belge|first2=Gazanfer|last3=Burchardt|first3=Käte|last4=Loeschke|first4=Siegfried|last5=Wosniok|first5=Werner|last6=Fu|first6=Xin|last7=Nimzyk|first7=Rolf|last8=Mohamed|first8=Salah A|last9=Drieschner|first9=Norbert|last10=Rippe|first10=Volkhard|last11=Bullerdiek|first11=Jörn|title=Decrease in thyroid adenoma associated (THADA) expression is a marker of dedifferentiation of thyroid tissue|journal=BMC Clinical Pathology|volume=11|issue=1|year=2011|pages=13|issn=1472-6890|doi=10.1186/1472-6890-11-13}}</ref> | * The target [[gene]] associated with [[thyroid]] [[adenoma]] has been identified and referred to as ''[[thyroid]] [[adenoma]] associated'' (''THADA'') gene.<ref name="pmid12955091">{{cite journal| author=Rippe V, Drieschner N, Meiboom M, Murua Escobar H, Bonk U, Belge G et al.| title=Identification of a gene rearranged by 2p21 aberrations in thyroid adenomas. | journal=Oncogene | year= 2003 | volume= 22 | issue= 38 | pages= 6111-4 | pmid=12955091 | doi=10.1038/sj.onc.1206867 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12955091 }} </ref><ref name="KlothBelge2011">{{cite journal|last1=Kloth|first1=Lars|last2=Belge|first2=Gazanfer|last3=Burchardt|first3=Käte|last4=Loeschke|first4=Siegfried|last5=Wosniok|first5=Werner|last6=Fu|first6=Xin|last7=Nimzyk|first7=Rolf|last8=Mohamed|first8=Salah A|last9=Drieschner|first9=Norbert|last10=Rippe|first10=Volkhard|last11=Bullerdiek|first11=Jörn|title=Decrease in thyroid adenoma associated (THADA) expression is a marker of dedifferentiation of thyroid tissue|journal=BMC Clinical Pathology|volume=11|issue=1|year=2011|pages=13|issn=1472-6890|doi=10.1186/1472-6890-11-13}}</ref> | ||
* In thyroid adenomas, [[protein]] associated with ''THADA'' was frequently found to be truncated. | * In thyroid adenomas, [[protein]] associated with ''THADA'' was frequently found to be truncated. | ||
* While competing with the full-length protein translated from the normal allele of ''THADA'', the altered [[protein]] derived from the truncated [[gene]] might lead to an impaired induction of [[apoptosis]], and subsequently give rise to an increased [[cell]] proliferation leading to benign thyroid tumors with 2p21 translocations, without significant changes of the expression level. | * While competing with the full-length protein translated from the normal allele of ''THADA'', the altered [[protein]] derived from the truncated [[gene]] might lead to an impaired induction of [[apoptosis]], and subsequently give rise to an increased [[cell]] proliferation leading to benign [[thyroid]] [[Tumor|tumors]] with 2p21 [[translocations]], without significant changes of the expression level. | ||
==Associated Conditions== | ==Associated Conditions== | ||
| Line 21: | Line 21: | ||
* [[Multinodular goiter]] | * [[Multinodular goiter]] | ||
==Gross Pathology== | ==Gross Pathology== | ||
Thyroid follicular adenoma ranges in diameter from 3 cm on an average, but sometimes is larger (up to 10 cm) or smaller. The typical [[thyroid]] [[adenoma]] is a solitary, spherical, and encapsulated lesion that is well demarcated from the surrounding parenchyma. The color ranges from gray-white to red-brown, depending upon: | Thyroid follicular [[adenoma]] ranges in diameter from 3 cm on an average, but sometimes is larger (up to 10 cm) or smaller. The typical [[thyroid]] [[adenoma]] is a solitary, spherical, and encapsulated lesion that is well demarcated from the surrounding parenchyma. The color ranges from gray-white to red-brown, depending upon: | ||
# The cellularity of the adenoma | # The cellularity of the [[adenoma]] | ||
# The colloid content | # The colloid content | ||
==Microscopic Pathology== | ==Microscopic Pathology== | ||
* Areas of [[hemorrhage]], [[fibrosis]], [[calcification]], and cystic change similar to what is found in multinodular | * Areas of [[hemorrhage]], [[fibrosis]], [[calcification]], and cystic change similar to what is found in [[multinodular goiter]]<nowiki/>s, are common in [[thyroid]] (follicular) [[adenoma]], particularly in larger lesions. | ||
* Encapsulated [[tumor]]s without evidence of infiltration may be found. | * Encapsulated [[tumor]]s without evidence of infiltration may be found. | ||
* [[Colloid]] nodules are distinguished by an apparently gelatinous mass of [[colloid]] both surrounding and contained within [[follicular cell]]s. Colloid nodules are not surrounded by a fibrous capsule of compressed [[tissue]]. However, they are surrounded by flattened [[epithelium|epithelial]] cells.<ref>{{cite web |url=http://rcpa.tv/parts/educational/anatomical/Dr_Alpha_Tsui/Thyroid_cytology.pdf |title=Thyroid cytology |author=Dr. Alpha Tsui |date=10 October 2010 |publisher=thyroidmanager.org |accessdate=26 September 2011}}</ref> Both the number of cells and the type of colloid may vary considerably.<ref>{{cite web |url=http://www.thyroidmanager.org/chapter%206d/fnabiopsy-frame.htm |title=Fine-Needle Aspiration Biopsy of the Thyroid Gland, Chapter 6d. |author=Diana S. Dean, M.D. Hossein Gharib, M.D. |date=10 October 2010 |publisher=thyroidmanager.org |accessdate=26 September 2011}}</ref> | * [[Colloid]] nodules are distinguished by an apparently gelatinous mass of [[colloid]] both surrounding and contained within [[follicular cell]]s. Colloid [[nodules]] are not surrounded by a fibrous [[capsule]] of compressed [[tissue]]. However, they are surrounded by flattened [[epithelium|epithelial]] cells.<ref>{{cite web |url=http://rcpa.tv/parts/educational/anatomical/Dr_Alpha_Tsui/Thyroid_cytology.pdf |title=Thyroid cytology |author=Dr. Alpha Tsui |date=10 October 2010 |publisher=thyroidmanager.org |accessdate=26 September 2011}}</ref> Both the number of cells and the type of colloid may vary considerably.<ref>{{cite web |url=http://www.thyroidmanager.org/chapter%206d/fnabiopsy-frame.htm |title=Fine-Needle Aspiration Biopsy of the Thyroid Gland, Chapter 6d. |author=Diana S. Dean, M.D. Hossein Gharib, M.D. |date=10 October 2010 |publisher=thyroidmanager.org |accessdate=26 September 2011}}</ref> | ||
<gallery> | <gallery> | ||
Image:Micropathology.jpg|Histology of the encapsulated tumor. (a) Photomicrograph showing an encapsulated tumor composed of cells arranged in microfollicular, glandular and trabecular patterns (hematoxylin and eosin; 100×). (b) High power photomicrograph showing the microfollicles containing inspissated colloid resembling hyaline globules and separated by eosinophilic extracellular hyaline material. (hematoxylin and eosin; 100×).<ref name=radio02>Image courtesy of Dr Frank Gaillard. [http://www.jmedicalcasereports.com/content/8/1/270] (original file[http://www.jmedicalcasereports.com/content/8/1/270‘’here’’]).[http://www.jmedicalcasereports.com/content/8/1/270/licence Creative Commons BY-SA-NC]</ref> | Image:Micropathology.jpg|Histology of the encapsulated tumor. (a) Photomicrograph showing an encapsulated tumor composed of cells arranged in microfollicular, glandular and trabecular patterns (hematoxylin and eosin; 100×). (b) High power photomicrograph showing the microfollicles containing inspissated colloid resembling hyaline globules and separated by eosinophilic extracellular hyaline material. (hematoxylin and eosin; 100×).<ref name=radio02>Image courtesy of Dr Frank Gaillard. [http://www.jmedicalcasereports.com/content/8/1/270] (original file[http://www.jmedicalcasereports.com/content/8/1/270‘’here’’]).[http://www.jmedicalcasereports.com/content/8/1/270/licence Creative Commons BY-SA-NC]</ref> | ||
Revision as of 14:47, 26 April 2019
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Thyroid adenoma Microchapters |
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Thyroid adenoma pathophysiology On the Web |
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Risk calculators and risk factors for Thyroid adenoma pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [3]; Associate Editor(s)-in-Chief: Ammu Susheela, M.D. [4]
Overview
Thyroid adenoma arises from the epithelial cells of the thyroid gland, which are normally involved in secretion of thyroxine hormone. The most common gene involved in the pathogenesis of thyroid adenoma is THADA gene.
Pathogenesis
Thyroid adenoma are lumps which commonly arise within an otherwise normal thyroid gland. They indicate a thyroid neoplasm.
- Sometimes a thyroid nodule presents as a fluid-filled cavity called a thyroid cyst. Often, solid components are mixed with the fluid. Thyroid cysts most commonly result from degenerating thyroid adenomas, which are benign, but they occasionally contain malignant solid components.
- A thyroid adenoma may be clinically silent, or it may be a "functional" tumor, producing excessive thyroid hormone. In this case, it may result in symptomatic hyperthyroidism, and may be referred to as a toxic thyroid adenoma.
Colloid Nodules
Colloid nodules are non-neoplastic benign nodules occurring within the thyroid gland. They form the vast majority of nodular thyroid disease. Colloid nodules are composed of irregularly enlarged follicles containing abundant colloid. Some colloid nodules can be cystic (cystic colloid nodule), and may contain areas of necrosis, hemorrhage, and calcification. Colloid nodules may be single or multiple and can vary considerably in size.[1]
Genetics
- The target gene associated with thyroid adenoma has been identified and referred to as thyroid adenoma associated (THADA) gene.[2][3]
- In thyroid adenomas, protein associated with THADA was frequently found to be truncated.
- While competing with the full-length protein translated from the normal allele of THADA, the altered protein derived from the truncated gene might lead to an impaired induction of apoptosis, and subsequently give rise to an increased cell proliferation leading to benign thyroid tumors with 2p21 translocations, without significant changes of the expression level.
Associated Conditions
Gross Pathology
Thyroid follicular adenoma ranges in diameter from 3 cm on an average, but sometimes is larger (up to 10 cm) or smaller. The typical thyroid adenoma is a solitary, spherical, and encapsulated lesion that is well demarcated from the surrounding parenchyma. The color ranges from gray-white to red-brown, depending upon:
- The cellularity of the adenoma
- The colloid content
Microscopic Pathology
- Areas of hemorrhage, fibrosis, calcification, and cystic change similar to what is found in multinodular goiters, are common in thyroid (follicular) adenoma, particularly in larger lesions.
- Encapsulated tumors without evidence of infiltration may be found.
- Colloid nodules are distinguished by an apparently gelatinous mass of colloid both surrounding and contained within follicular cells. Colloid nodules are not surrounded by a fibrous capsule of compressed tissue. However, they are surrounded by flattened epithelial cells.[4] Both the number of cells and the type of colloid may vary considerably.[5]
-
![Histology of the encapsulated tumor. (a) Photomicrograph showing an encapsulated tumor composed of cells arranged in microfollicular, glandular and trabecular patterns (hematoxylin and eosin; 100×). (b) High power photomicrograph showing the microfollicles containing inspissated colloid resembling hyaline globules and separated by eosinophilic extracellular hyaline material. (hematoxylin and eosin; 100×).[6]](/images/d/dc/Micropathology.jpg)
Histology of the encapsulated tumor. (a) Photomicrograph showing an encapsulated tumor composed of cells arranged in microfollicular, glandular and trabecular patterns (hematoxylin and eosin; 100×). (b) High power photomicrograph showing the microfollicles containing inspissated colloid resembling hyaline globules and separated by eosinophilic extracellular hyaline material. (hematoxylin and eosin; 100×).[6]
![Histology of the encapsulated tumor. (a) Photomicrograph showing an encapsulated tumor composed of cells arranged in microfollicular, glandular and trabecular patterns (hematoxylin and eosin; 100×). (b) High power photomicrograph showing the microfollicles containing inspissated colloid resembling hyaline globules and separated by eosinophilic extracellular hyaline material. (hematoxylin and eosin; 100×).[6]](/index.php/File:Micropathology.jpg){kind=small}
Reference
- ↑ Zacks JF, de las Morenas A, Beazley RM, O'Brien MJ (1998). "Fine-needle aspiration cytology diagnosis of colloid nodule versus follicular variant of papillary carcinoma of the thyroid". Diagn Cytopathol. 18 (2): 87–90. PMID 9484634.
- ↑ Rippe V, Drieschner N, Meiboom M, Murua Escobar H, Bonk U, Belge G; et al. (2003). "Identification of a gene rearranged by 2p21 aberrations in thyroid adenomas". Oncogene. 22 (38): 6111–4. doi:10.1038/sj.onc.1206867. PMID 12955091.
- ↑ Kloth, Lars; Belge, Gazanfer; Burchardt, Käte; Loeschke, Siegfried; Wosniok, Werner; Fu, Xin; Nimzyk, Rolf; Mohamed, Salah A; Drieschner, Norbert; Rippe, Volkhard; Bullerdiek, Jörn (2011). "Decrease in thyroid adenoma associated (THADA) expression is a marker of dedifferentiation of thyroid tissue". BMC Clinical Pathology. 11 (1): 13. doi:10.1186/1472-6890-11-13. ISSN 1472-6890.
- ↑ Dr. Alpha Tsui (10 October 2010). "Thyroid cytology" (PDF). thyroidmanager.org. Retrieved 26 September 2011.
- ↑ Diana S. Dean, M.D. Hossein Gharib, M.D. (10 October 2010). "Fine-Needle Aspiration Biopsy of the Thyroid Gland, Chapter 6d". thyroidmanager.org. Retrieved 26 September 2011.
- ↑ Image courtesy of Dr Frank Gaillard. [1] (original file[2]).Creative Commons BY-SA-NC