Difference between revisions of "Thyroid gland"

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==Pitfalls/weird stuff==
==Pitfalls/weird stuff==
*Thyroid tissue lateral to the jugular vein (often referred to as ''lateral aberrant thyroid tissue'') is generally considered metastatic thyroid carcinoma ([[papillary thyroid carcinoma]]) even if it looks benign.<ref name=pmid14452106>{{Cite journal  | last1 = JOHNSON | first1 = RW. | last2 = SAHA | first2 = NC. | title = The so-called lateral aberrant thyroid. | journal = Br Med J | volume = 1 | issue = 5293 | pages = 1668-9 | month = Jun | year = 1962 | doi =  | PMID = 14452106 | PMC = 1958877 }}</ref>
*Thyroid tissue lateral to the jugular vein (often referred to as ''[[lateral aberrant thyroid tissue]]'') is generally considered metastatic thyroid carcinoma ([[papillary thyroid carcinoma]]) even if it looks benign.<ref name=pmid14452106>{{Cite journal  | last1 = JOHNSON | first1 = RW. | last2 = SAHA | first2 = NC. | title = The so-called lateral aberrant thyroid. | journal = Br Med J | volume = 1 | issue = 5293 | pages = 1668-9 | month = Jun | year = 1962 | doi =  | PMID = 14452106 | PMC = 1958877 }}</ref>
**This dictum is disputed.<ref name=pmid17319317>{{Cite journal  | last1 = Escofet | first1 = X. | last2 = Khan | first2 = AZ. | last3 = Mazarani | first3 = W. | last4 = Woods | first4 = WG. | title = Lessons to be learned: a case study approach. Lateral aberrant thyroid tissue: is it always malignant? | journal = J R Soc Promot Health | volume = 127 | issue = 1 | pages = 45-6 | month = Jan | year = 2007 | doi =  | PMID = 17319317 }}</ref>
**This dictum is disputed.<ref name=pmid17319317>{{Cite journal  | last1 = Escofet | first1 = X. | last2 = Khan | first2 = AZ. | last3 = Mazarani | first3 = W. | last4 = Woods | first4 = WG. | title = Lessons to be learned: a case study approach. Lateral aberrant thyroid tissue: is it always malignant? | journal = J R Soc Promot Health | volume = 127 | issue = 1 | pages = 45-6 | month = Jan | year = 2007 | doi =  | PMID = 17319317 }}</ref>
**The level VI and VII [[lymph nodes]] are medial to the jugular.
**The level VI and VII [[lymph nodes]] are medial to the jugular.
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*[[Follicular thyroid carcinoma|Follicular carinoma]].
*[[Follicular thyroid carcinoma|Follicular carinoma]].
*[[Medullary thyroid carcinoma|Medullary carcinoma]].
*[[Medullary thyroid carcinoma|Medullary carcinoma]].
*Undifferentiated (anaplastic) carcinoma.
*[[Anaplastic thyroid carcinoma|Undifferentiated (anaplastic) carcinoma]].


*Poorly differentiated carcinoma.
*[[Poorly differentiated thyroid carcinoma|Poorly differentiated carcinoma]].
*[[Squamous cell carcinoma]].
*[[Squamous cell carcinoma]].
*[[Mucoepidermoid carcinoma]].
*[[Mucoepidermoid carcinoma]].
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*p63 +ve.
*p63 +ve.
**-ve in clear cells.
**-ve in clear cells.
*CEA +ve (polyconal).<ref name=pmid7509563>{{cite journal |author=Mizukami Y, Nonomura A, Michigishi T, ''et al.'' |title=Solid cell nests of the thyroid. A histologic and immunohistochemical study |journal=Am. J. Clin. Pathol. |volume=101 |issue=2 |pages=186–91 |year=1994 |month=February |pmid=7509563 |doi= |url=}}</ref>
*[[CEA]] +ve (polyconal).<ref name=pmid7509563>{{cite journal |author=Mizukami Y, Nonomura A, Michigishi T, ''et al.'' |title=Solid cell nests of the thyroid. A histologic and immunohistochemical study |journal=Am. J. Clin. Pathol. |volume=101 |issue=2 |pages=186–91 |year=1994 |month=February |pmid=7509563 |doi= |url=}}</ref>
**+ve also in clear cells.
**+ve also in clear cells.
*Chromogranin A +ve ~45% of cases.<ref name=pmid7509563/>
*Chromogranin A +ve ~45% of cases.<ref name=pmid7509563/>
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*[[AKA]] ''[[nodular hyperplasia]]''.
*[[AKA]] ''[[nodular hyperplasia]]''.
*[[AKA]] ''adenomatoid nodule''.
*[[AKA]] ''adenomatoid nodule''.
 
{{Main|Thyroid gland nodular hyperplasia}}
===General===
*Clinical diagnosis: ''goitre'', [[AKA]] ''sporadic goitre'', AKA ''multinodular goitre'' (MNG).
*Most common diagnosis in the thyroid.
**If you've seen a handful of thyroids you've seen this.
 
Notes:
*Large lesions may be clonal; however, this is clinically irrelevant.
 
===Gross===
Features:
*Enlarge thyroid gland.
*+/-Distinct (well-circumscribed) nodules.
 
===Microscopic===
Features:
*Follicles of variable size - '''key feature'''.
**Should be obvious at low power, i.e. with the 2.5x objective.
*+/-Nodules.
**Do not have a thick fibrous capsule.
**May have a high cellularity.
**Architecture: solid or microfollicular.<ref name=Ref_EP36>{{Ref EP|36}}</ref>
 
Negatives:
*No nuclear features suggestive of malignancy (at lower power).
**One should not look at high power.
*Not cellular.
 
DDx:
*[[Papillary thyroid carcinoma]] - esp. [[papillary thyroid carcinoma follicular variant]].
*[[Follicular thyroid adenoma]] - contained in a fibrous capsule.
*[[Follicular thyroid carcinoma]] - has fibrous capsule and invasion through it.
 
===Sign out===
<pre>
HEMITHYROID, RIGHT, HEMITHYROIDECTOMY:
- NODULAR HYPERPLASIA.
- NEGATIVE FOR MALIGNANCY.
</pre>
 
<pre>
HEMITHYROID, RIGHT, HEMITHYROIDECTOMY:
- CELLULAR ADENOMATOID NODULE ON A BACKGROUND OF NODULAR HYPERPLASIA.
- NEGATIVE FOR MALIGNANCY.
</pre>
 
====Micro====
The sections show thyroid gland with follicles of variable size and marked enlargement.
A lymphocytic infiltrate is present. Focal germinal centre formation is present.  Oncocytic changes and reactive changes are seen focally. No significant nuclear atypia is identified.


==Follicular thyroid adenoma==
==Follicular thyroid adenoma==
*[[AKA]] follicular adenoma, [[AKA]] thyroid follicular adenoma.
*[[AKA]] follicular adenoma, [[AKA]] thyroid follicular adenoma.
===General===
{{Main|Follicular thyroid adenoma}}
*Most common neoplasm of thyroid.<ref name=Ref_EP51>{{Ref EP|51}}</ref>
*Encapusled lesion (surrounded by fibrous capsule).
 
===Gross===
*Thick capsule.
 
Notes:
*The entire capsule should be submitted.<ref>SR. 17 January 2011.</ref>
**A good start for most thyroid specimens with a thick capsule is 10 blocks.
 
===Microsopic===
Features:
*Cellular.
*Thick capsule - '''key feature'''.
 
Negatives.
*No invasion of the capsule (see ''[[follicular thyroid carcinoma]]'' section).
*No nuclear features suggestive of [[papillary thyroid carcinoma]].
 
DDx:
*[[Thyroid gland nodular hyperplasia]] with an encapsulated nodule - not as cellular.


==Graves disease==
==Graves disease==
===General===
{{Main|Graves' disease}}
*Often misspelled "Grave's disease".
*Autoimmune disease leading to hyperthyroidism.
*Eye problems not resolved with thyroid removal.{{fact}}
*Higher risk of [[papillary thyroid carcinoma]].
 
Clinical:
*TSH-receptor antibody +ve.<ref name=pmid19576193>{{Cite journal  | last1 = Massart | first1 = C. | last2 = Gibassier | first2 = J. | last3 = d'Herbomez | first3 = M. | title = Clinical value of M22-based assays for TSH-receptor antibody (TRAb) in the follow-up of antithyroid drug treated Graves' disease: comparison with the second generation human TRAb assay. | journal = Clin Chim Acta | volume = 407 | issue = 1-2 | pages = 62-6 | month = Sep | year = 2009 | doi = 10.1016/j.cca.2009.06.033 | PMID = 19576193 }}</ref>
 
===Gross===
Features:<ref>{{Ref EP|30}}</ref>
*Enlarged 50-150 g.
*"Beefy-red" appearance, looks like raw beef.
 
===Microscopic===
Features:
*Classic:
**Hypercellular
**Patchy lymphocytes.
**Little colloid.
*Scalloping of colloid; colloid has undulating border.
**Non-specific finding.
*+/-Nuclear clearing.
*+/-Papillae (may mimic papillary thyroid carcinoma in this respect).
 
Notes:
*Usually has an unimpressive appearance... as it is treated, i.e. history is important.
*Nuclear clearing and papillae are usu. diffuse in Graves disease - unlike in papillary thyroid carcinoma.
 
Image:
*[http://library.med.utah.edu/WebPath/jpeg4/ENDO022.jpg Graves disease (med.utah.edu)].<ref>URL: [http://library.med.utah.edu/WebPath/EXAM/IMGQUIZ/enfrm.html http://library.med.utah.edu/WebPath/EXAM/IMGQUIZ/enfrm.html]. Accessed on: 4 December 2011.</ref>


==Idiopathic granulomatous thyroiditis==
==Idiopathic granulomatous thyroiditis==
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Clinical:
Clinical:
*Tenderness.<ref name=pmid22538753>{{Cite journal  | last1 = Szczepanek-Parulska | first1 = E. | last2 = Zybek | first2 = A. | last3 = Biczysko | first3 = M. | last4 = Majewski | first4 = P. | last5 = Ruchała | first5 = M. | title = What might cause pain in the thyroid gland? Report of a patient with subacute thyroiditis of atypical presentation. | journal = Endokrynol Pol | volume = 63 | issue = 2 | pages = 138-42 | month =  | year = 2012 | doi =  | PMID = 22538753 }}</ref>
*Tenderness.<ref name=pmid22538753>{{Cite journal  | last1 = Szczepanek-Parulska | first1 = E. | last2 = Zybek | first2 = A. | last3 = Biczysko | first3 = M. | last4 = Majewski | first4 = P. | last5 = Ruchała | first5 = M. | title = What might cause pain in the thyroid gland? Report of a patient with subacute thyroiditis of atypical presentation. | journal = Endokrynol Pol | volume = 63 | issue = 2 | pages = 138-42 | month =  | year = 2012 | doi =  | PMID = 22538753 }}</ref>
Management:
*Medical.
*Rarely surgery.<ref>{{Cite journal  | last1 = Volpé | first1 = R. | title = The management of subacute (DeQuervain's) thyroiditis. | journal = Thyroid | volume = 3 | issue = 3 | pages = 253-5 | month =  | year = 1993 | doi =  | PMID = 8257868 }}</ref>


===Microscopic===
===Microscopic===
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==Riedel thyroiditis==
==Riedel thyroiditis==
*[[AKA]] ''invasive fibrous thyroiditis''.<ref name=pmid21568724>{{Cite journal  | last1 = Fatourechi | first1 = MM. | last2 = Hay | first2 = ID. | last3 = McIver | first3 = B. | last4 = Sebo | first4 = TJ. | last5 = Fatourechi | first5 = V. | title = Invasive fibrous thyroiditis (Riedel thyroiditis): the Mayo Clinic experience, 1976-2008. | journal = Thyroid | volume = 21 | issue = 7 | pages = 765-72 | month = Jul | year = 2011 | doi = 10.1089/thy.2010.0453 | PMID = 21568724 }}</ref>
*[[AKA]] ''invasive fibrous thyroiditis''.<ref name=pmid21568724>{{Cite journal  | last1 = Fatourechi | first1 = MM. | last2 = Hay | first2 = ID. | last3 = McIver | first3 = B. | last4 = Sebo | first4 = TJ. | last5 = Fatourechi | first5 = V. | title = Invasive fibrous thyroiditis (Riedel thyroiditis): the Mayo Clinic experience, 1976-2008. | journal = Thyroid | volume = 21 | issue = 7 | pages = 765-72 | month = Jul | year = 2011 | doi = 10.1089/thy.2010.0453 | PMID = 21568724 }}</ref>
===General===
{{Main|Riedel thyroiditis}}
Clinical features:<ref name=pmid21568724/>
*Extremely rare.
*Women > men.
*Usually smokers.
*May be associated with ''[[retroperitoneal fibrosis]]''.
*May be hypothyroid.
*+/-Obstructive symptoms.
 
===Microscopic===
Features:
*Fibrosis.
*Specimen often fragmented as it was difficult to remove.
 
DDx:
*[[Anaplastic thyroid carcinoma|Anaplastic carcinoma]], spindle cell variant.


==Hashimoto thyroiditis==
==Hashimoto thyroiditis==
===General===
{{Main|Hashimoto's thyroiditis}}
*'''This is a clinical diagnosis'''.
**The histomorphologic findings, generally, are '''not''' diagnostic.
 
Etiology:
*Autoimmune disease leading to hypothyroidism.
**Often genetic/part of a syndrome.
 
====Clinical====
Serology:<ref name=pmid7813361>{{cite journal |author=Poropatich C, Marcus D, Oertel YC |title=Hashimoto's thyroiditis: fine-needle aspirations of 50 asymptomatic cases |journal=Diagn. Cytopathol. |volume=11 |issue=2 |pages=141–5 |year=1994 |pmid=7813361 |doi= |url=http://www3.interscience.wiley.com/journal/112701408/abstract?CRETRY=1&SRETRY=0}}</ref>
*Antimicrosomal (antithyroid peroxidase) +ve.
*Antithyroglobulin +ve.
 
Associated pathology:<ref name=pmid7813361/>
*Increased risk of B-cell lymphoma; these are classically:<ref name=pmid18018576 >{{Cite journal  | last1 = Ohye | first1 = H. | last2 = Fukata | first2 = S. | last3 = Hirokawa | first3 = M. | title = [Malignant lymphoma of the thyroid]. | journal = Nihon Rinsho | volume = 65 | issue = 11 | pages = 2092-8 | month = Nov | year = 2007 | doi =  | PMID = 18018576 }}</ref>
**[[MALT lymphoma]].
**[[Diffuse large B cell lymphoma]] (DLBCL).
 
===Microscopic===
Features:
*Lymphocytic infiltrate - '''key feature'''.
*Nuclear clearing common.
**May confuse with [[papillary thyroid carcinoma]].
*Polymorphous lymphoplasmacytic infiltrate with germinal centres.<ref name=Ref_APBR672>{{Ref APBR|672}}</ref>
*+/-Oncocytic metaplasia.
 
Notes:
*Histologically often '''not''' possible to separate from "non-specific" thyroiditis.<ref name=Ref_Sternberg4_560>{{Ref Sternberg4|560}}</ref>
 
DDx:
*[[Lymphocytic thyroiditis]].
*[[Papillary thyroid carcinoma]].
*[[MALT lymphoma]].
*[[Diffuse large B cell lymphoma]].
 
===IHC===
*Panel to exclude lymphoma may be required, e.g. CD3, CD20, CD10, BCL6, BCL2, kappa, lambda.
 
===Molecular===
*Occasionally done to exclude lymphoma - see ''[[MALT lymphoma]]'' and ''[[DLBCL]]''.


==C-cell hyperplasia==
==C-cell hyperplasia==
*Abbreviated ''CCH''.
*Abbreviated ''CCH''.
===General===
{{Main|C-cell hyperplasia}}
*Screening for C-cell hyperplasia/[[medullary thyroid carcinoma]] done with ''serum calcitonin level''.<ref name=pmid19726541>{{cite journal |author=Machens A, Hoffmann F, Sekulla C, Dralle H |title=Importance of gender-specific calcitonin thresholds in screening for occult sporadic medullary thyroid cancer |journal=Endocr. Relat. Cancer |volume=16 |issue=4 |pages=1291–8 |year=2009 |month=December |pmid=19726541 |doi=10.1677/ERC-09-0136 |url=http://erc.endocrinology-journals.org/cgi/content/full/16/4/1291}}</ref>


===Gross===
==Adenolipoma of the thyroid==
*Not visible.
{{Main|Adenolipoma of the thyroid}}
 
===Microscopic===
Features:
*Location:<ref>URL: [http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/Thyroid_11protocol.pdf http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/Thyroid_11protocol.pdf]. Accessed on: 7 April 2012.</ref>
**Mid portion of lobe to upper third of lobe.
***Not at the poles.
***Not in the isthmus.
 
*Definitions vary.<ref>SR. 17 January 2011.</ref>
 
One definition - either of the following:<ref name=pmid19726541>{{cite journal |author=Machens A, Hoffmann F, Sekulla C, Dralle H |title=Importance of gender-specific calcitonin thresholds in screening for occult sporadic medullary thyroid cancer |journal=Endocr. Relat. Cancer |volume=16 |issue=4 |pages=1291–8 |year=2009 |month=December |pmid=19726541 |doi=10.1677/ERC-09-0136 |url=http://erc.endocrinology-journals.org/cgi/content/full/16/4/1291}}</ref>
#>50 C-cells per low-power field (x100).
#*This part of the definition suffers from [[LPFitis]]. The paper should have been rejected.
#Confined to the thyroid gland and no larger than 10 mm in greatest dimension.
 
Another definition:
*Invasion of the basement membrane with stromal reaction.
 
A third definition:
*"Several clusters" of more than six C cells.
 
====Images====
*[http://www.nature.com/modpathol/journal/v16/n8/fig_tab/3880836f2.html CCH - crappy B&W image (nature.com)].<ref>{{Cite journal  | last1 = Guyétant | first1 = S. | last2 = Josselin | first2 = N. | last3 = Savagner | first3 = F. | last4 = Rohmer | first4 = V. | last5 = Michalak | first5 = S. | last6 = Saint-André | first6 = JP. | title = C-cell hyperplasia and medullary thyroid carcinoma: clinicopathological and genetic correlations in 66 consecutive patients. | journal = Mod Pathol | volume = 16 | issue = 8 | pages = 756-63 | month = Aug | year = 2003 | doi = 10.1097/01.MP.0000081727.75778.0C | PMID = 12920219 }}</ref>
*[http://www.nature.com/modpathol/journal/v16/n8/fig_tab/3880836f3.htm CCH - crappy B&W image (nature.com)].
*[http://www.forpath.org/workshops/0201/photos/fullsize/cas7c.jpg CCH (forpath.org)].<ref>URL: [http://www.forpath.org/workshops/0201/html/case_7.asp http://www.forpath.org/workshops/0201/html/case_7.asp]. Accessed on: 21 May 2013.</ref>
*[http://alf3.urz.unibas.ch/pathopic/e/getpic-fra.cfm?id=4849 CCH (unibas.ch)].
*[http://alf3.urz.unibas.ch/pathopic/e/getpic-fra.cfm?id=10739 Nodular CCH (unibas.ch)].


=Malignant neoplasm=
=Malignant neoplasm=
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==Insular carcinoma==
==Insular carcinoma==
===General===
{{Main|Insular thyroid carcinoma}}
Features:<ref name=pmid17665497>{{cite journal |author=Rufini V, Salvatori M, Fadda G, ''et al.'' |title=Thyroid carcinomas with a variable insular component: prognostic significance of histopathologic patterns |journal=Cancer |volume=110 |issue=6 |pages=1209–17 |year=2007 |month=September |pmid=17665497 |doi=10.1002/cncr.22913 |url=}}</ref>
*Rare - approximately 5% of all thyroid carcinomas.
*Thought to be a separate tumour from papillary thyroid carcinoma and follicular thyroid carcinoma with a focal insular pattern.
*Some lump this entity with papillary carcinoma, i.e. consider it a variant of papillary thyroid carcinoma.
 
===Microscopic===
Features:<ref name=pmid17665497/>
*Islands of cells - '''key feature'''.
*Scant cytoplasm.
*Nuclei monomorphic and round.
 
DDx:<ref>Endo. fellow. 17 September 2009.</ref>
*[[Medullary thyroid carcinoma]].
*Poorly differentiated thyroid carcinoma.


==Follicular thyroid carcinoma==
==Follicular thyroid carcinoma==
*[[AKA]] ''follicular carcinoma''.
*[[AKA]] ''follicular carcinoma''.
===Clinical===
{{Main|Follicular thyroid carcinoma}}
Medical school memory device ''4 Fs'':
*FNA NOT diagnosable.
*Far away mets (sometimes).
*Female predominant.
*Favourable prognosis.
 
Notes:
*Usu. has a hematologic spread.
**PTC usu. spread via lymphatics.
 
===Microscopic===
Features:
*Defined by either:
*#Invasion through the capsule:
*#*Should be all the way through.<ref>SR. 17 January 2011.</ref>
*#**1/2 does not count.
*#**Fibrous reaction does not count.
*#**"Above the contour" does not count.
*#Vascular invasion (all of the following):
*##In a small vein (not a capillary), that is outside of the tumour mass.
*##Tumour adherent to the side of the vessel.
*##Tumour must be re-endothelialized.
 
Notes:
*'''Impossible''' to differentiate from ''[[follicular thyroid adenoma|follicular adenoma]]'' on FNA (no cytologic differences).
*Described as "over-diagnosed" ... misdiagnoses: PTC follicular variant, follicular adenoma, multinodular goitre with a thick capsule.
 
Images:
*[http://path.upmc.edu/cases/case653.html Follicular thyroid carcinoma - several images (upmc.edu)].


==Medullary thyroid carcinoma==
==Medullary thyroid carcinoma==
*Abbreviated ''MTC''.
*Abbreviated ''MTC''.
{{Main|Medullary thyroid carcinoma}}
{{Main|Medullary thyroid carcinoma}}
==Poorly differentiated thyroid carcinoma==
{{Main|Poorly differentiated thyroid carcinoma}}


==Anaplastic thyroid carcinoma==
==Anaplastic thyroid carcinoma==
===Epidemiology===
{{Main|Anaplastic thyroid carcinoma}}
*Very rare.
*Horrible prognosis.
*Often presents with obstruction.
*Typically there is a history of a thyroid mass.
 
===Microscopic===
Features:
*Cytologically malignant:
**Huge [[NC ratio]].
**Mitoses.
*+/-[[Necrosis]].
 
Notes:
*May have features of other thyroid carcinomas, e.g. psammoma bodies, papillae, nuclear changes of PTC.
 
Image: [http://commons.wikimedia.org/wiki/File:Anaplastic_thyroid_carcinoma_low_mag.jpg Anaplastic thyroid carcinoma with a component of papillary thyroid carcinoma (WC)].
 
DDx:
*[[Poorly differentiated carcinoma of the thyroid|Poorly differentiated carcinoma]].
*[[Squamous cell carcinoma]].
*[[Medullary thyroid carcinoma]].
*Sarcoma.
 
===IHC===
*Keratin (AE1/AE3) +ve.
*Vimentin +ve, >90%.<ref name=pmid1712540>{{cite journal |author=Ordóñez NG, El-Naggar AK, Hickey RC, Samaan NA |title=Anaplastic thyroid carcinoma. Immunocytochemical study of 32 cases |journal=Am. J. Clin. Pathol. |volume=96 |issue=1 |pages=15–24 |year=1991 |month=July |pmid=1712540 |doi= |url=}}</ref>
*Thyroglobulin - rarely +ve (~15%).<ref name=pmid1712540/>
*CEA -ve, calcitonin -ve; to r/o medullary.
*p53 +ve.
*TTF-1 +ve.


==Lymphomas of the thyroid==
==Lymphomas of the thyroid==
Line 507: Line 260:
*[[AKA]] ''hyalinizing trabecular adenoma''.
*[[AKA]] ''hyalinizing trabecular adenoma''.
*Abbreviated ''HTT''.
*Abbreviated ''HTT''.
===General===
{{Main|Hyalinizing trabecular tumour}}
*Considered by some (e.g. Silvia Asa) to be a variant of [[papillary thyroid carcinoma]].<ref name=pmid11117782>{{cite journal |author=Cheung CC, Boerner SL, MacMillan CM, Ramyar L, Asa SL |title=Hyalinizing trabecular tumor of the thyroid: a variant of papillary carcinoma proved by molecular genetics |journal=Am. J. Surg. Pathol. |volume=24 |issue=12 |pages=1622–6 |year=2000 |month=December |pmid=11117782 |doi= |url=}}</ref>
*Behaviour similar to papillary thyroid carcinoma - indolent.
 
===Microscopic===
Features:
*Trabecular arrangement of cells.
**May have "curved" trabeculae.
*Extracellular space has hyaline material - '''key feature'''.
*Cytoplasm mimics hyaline material in the extracellular space.
 
DDx:
*[[Papillary thyroid carcinoma]] (if one believes this is a separate entity).
*[[Medullary thyroid carcinoma]] - not trabecular, nuclei not [[PTC]]-like.
*[[Paraganglioma]].<ref>URL: [http://path.upmc.edu/cases/case465/dx.html http://path.upmc.edu/cases/case465/dx.html]. Accessed on: 17 January 2011.</ref>
 
====Images====
<gallery>
Image: Hyalinized trabecular tumour - low mag.jpg | HHT - low mag. (WC)
Image: Hyalinized trabecular tumour - intermed mag.jpg | HHT - intermed. mag. (WC)
Image: Hyalinized trabecular tumour - high mag.jpg | HHT - high mag. (WC)
Image: Thyroid gland - high mag.jpg | Thyroid gland - high mag. (WC)
 
Image: Hyalinized trabecular tumour - 2 - intermed mag.jpg | HHT - intermed. mag. (WC)
Image: Hyalinized trabecular tumour - 2 - high mag.jpg | HHT - high mag. (WC)
 
Image: Hyalinized trabecular tumour - 3 - intermed mag.jpg | HHT - intermed. mag. (WC)
Image: Hyalinized trabecular tumour - 3 - high mag.jpg | HHT - high mag. (WC)
Image: Hyalinized trabecular tumour - 3 - very high mag.jpg | HHT - very high mag. (WC)
</gallery>
www:
*[http://archive.biomedcentral.com/1742-6413/3/17/figure/F2?highres=y HTT (biomedcentral.com)].<ref name=pmid16867191>{{Cite journal  | last1 = Baloch | first1 = ZW. | last2 = Puttaswamy | first2 = K. | last3 = Brose | first3 = M. | last4 = LiVolsi | first4 = VA. | title = Lack of BRAF mutations in hyalinizing trabecular neoplasm. | journal = Cytojournal | volume = 3 | issue =  | pages = 17 | month =  | year = 2006 | doi = 10.1186/1742-6413-3-17 | PMID = 16867191 }}</ref>
*[http://www.ispub.com/journal/the-internet-journal-of-endocrinology/volume-2-number-1/hyalinizing-trabecular-neoplasm-of-the-thyroid-controversies-in-management.article-g01.fs.jpg HTT (ispub.com)].<ref>URL: [http://www.ispub.com/journal/the-internet-journal-of-endocrinology/volume-2-number-1/hyalinizing-trabecular-neoplasm-of-the-thyroid-controversies-in-management.html http://www.ispub.com/journal/the-internet-journal-of-endocrinology/volume-2-number-1/hyalinizing-trabecular-neoplasm-of-the-thyroid-controversies-in-management.html]. Accessed on: 1 January 2012.</ref>
 
===IHC===
*Thyroglobulin +ve.
*NSE +ve.


==Hürthle cell neoplasm==
==Hürthle cell neoplasm==
*[[AKA]] ''oncocytic neoplasm''.
*[[AKA]] ''oncocytic neoplasm''.
*Also spelled ''Hurthle cell neoplasm''.
*Also spelled ''Hurthle cell neoplasm''.
 
{{Main|Hürthle cell neoplasm}}
===General===
*Incidence: uncommon.
*This is a general category - includes:
**Hürthle cell adenoma.
**Hürthle cell carcinoma.
 
*Some advocate ''total thyroidectomy'' for all Hürthle cell neoplasms, as it is difficult to reliably differentiate adenomas and carcinomas.<ref name=pmid9697901>{{Cite journal  | last1 = Wasvary | first1 = H. | last2 = Czako | first2 = P. | last3 = Poulik | first3 = J. | last4 = Lucas | first4 = R. | title = Unilateral lobectomy for Hurthle cell adenoma. | journal = Am Surg | volume = 64 | issue = 8 | pages = 729-32; discussion 732-3 | month = Aug | year = 1998 | doi =  | PMID = 9697901 }}</ref>
*It can be understood as a special type of ''follicular neoplasm'' (including ''[[follicular thyroid adenoma]]'' and ''[[follicular thyroid carcinoma]]'').<ref name=Ref_EP104>{{Ref EP|104}}</ref>
 
====Adenoma vs. carcinoma====
Suggestive for carcinoma:<ref name=pmid9697901/>
*Male.
*>4 cm
**Adenomas usu. <3 cm.
Definite for carcinoma:<ref name=pmid9697901/>
*Lymphovascular invasion.
*Capsular invasion.
 
===Gross===
*Yellow.
*Encapsulated.
 
===Microscopic===
Features:<ref name=Ref_EP104>{{Ref EP|104}}</ref>
*Oncocytes >= 75% of cells:
**Abundant granular, eosinophilic cytoplasm.
**Round regular nucleus +/- prominent nucleolus.
*+/-Degenerative changes.
 
Negatives:
*Lack nuclear features of [[papillary thyroid carcinoma]].
*Lack features of [[medullary thyroid carcinoma]].
 
DDx:<ref name=pmid18684023>{{cite journal |author=Montone KT, Baloch ZW, LiVolsi VA |title=The thyroid Hürthle (oncocytic) cell and its associated pathologic conditions: a surgical pathology and cytopathology review |journal=Arch. Pathol. Lab. Med. |volume=132 |issue=8 |pages=1241–50 |year=2008 |month=August |pmid=18684023 |doi= |url=}}</ref>
*Papillary thyroid carcinoma oncocytic variant.
*Medullary thyroid carcinoma oncocytic variant.
*Others.


==Minocycline associated thyroid pigmentation==
==Minocycline associated thyroid pigmentation==
Line 592: Line 272:
===General===
===General===
*Benign pigmentation of the thyroid due to ''minocycline'', an antibiotic.
*Benign pigmentation of the thyroid due to ''minocycline'', an antibiotic.
**Reported at other sites, e.g. [[heart valves]],<ref name=pmid10615019/> coronary arteries.
**Reported at other sites, e.g. [[heart valves]],<ref name=pmid10615019/> [[skin]],<ref name=pmid19595269>{{cite journal |author=Geria AN, Tajirian AL, Kihiczak G, Schwartz RA |title=Minocycline-induced skin pigmentation: an update |journal=Acta Dermatovenerol Croat |volume=17 |issue=2 |pages=123–6 |year=2009 |pmid=19595269 |doi= |url=}}</ref> coronary arteries.


===Gross===
===Gross===
Line 612: Line 292:
*Pigment described as ''lipofuscin-like''.<ref name=pmid6435454>{{Cite journal  | last1 = Gordon | first1 = G. | last2 = Sparano | first2 = BM. | last3 = Kramer | first3 = AW. | last4 = Kelly | first4 = RG. | last5 = Iatropoulos | first5 = MJ. | title = Thyroid gland pigmentation and minocycline therapy. | journal = Am J Pathol | volume = 117 | issue = 1 | pages = 98-109 | month = Oct | year = 1984 | doi =  | PMID = 6435454 | PMC = 1900569 }}</ref>
*Pigment described as ''lipofuscin-like''.<ref name=pmid6435454>{{Cite journal  | last1 = Gordon | first1 = G. | last2 = Sparano | first2 = BM. | last3 = Kramer | first3 = AW. | last4 = Kelly | first4 = RG. | last5 = Iatropoulos | first5 = MJ. | title = Thyroid gland pigmentation and minocycline therapy. | journal = Am J Pathol | volume = 117 | issue = 1 | pages = 98-109 | month = Oct | year = 1984 | doi =  | PMID = 6435454 | PMC = 1900569 }}</ref>


Images:
====Images====
*[http://flylib.com/books/2/953/1/html/2/44%20-%20Thyroid_files/DA11C44FF7.png Pigmentation due to minocycline (flylib.com)].<ref>URL: [http://flylib.com/books/en/2.953.1.50/1/ http://flylib.com/books/en/2.953.1.50/1/]. Accessed on: 11 March 2012.</ref>
*[http://www.archivesofpathology.org/doi/full/10.1043/1543-2165(2004)128%3C355:PQCTIP%3E2.0.CO;2 Minocycline thyroid - gross and microscopic (archivesofpathology.org)].<ref name=pmid14987144>{{Cite journal  | last1 = Raghavan | first1 = R. | last2 = Snyder | first2 = WH. | last3 = Sharma | first3 = S. | title = Pathologic quiz case: tumor in pigmented thyroid gland in a young man. Papillary thyroid carcinoma in a minocycline-induced, diffusely pigmented thyroid gland. | journal = Arch Pathol Lab Med | volume = 128 | issue = 3 | pages = 355-6 | month = Mar | year = 2004 | doi = 10.1043/1543-2165(2004)128355:PQCTIP2.0.CO;2 | PMID = 14987144 }}</ref>
*[http://www.archivesofpathology.org/doi/full/10.1043/1543-2165(2004)128%3C355:PQCTIP%3E2.0.CO;2 Minocycline thyroid - gross and microscopic (archivesofpathology.org)].<ref name=pmid14987144>{{Cite journal  | last1 = Raghavan | first1 = R. | last2 = Snyder | first2 = WH. | last3 = Sharma | first3 = S. | title = Pathologic quiz case: tumor in pigmented thyroid gland in a young man. Papillary thyroid carcinoma in a minocycline-induced, diffusely pigmented thyroid gland. | journal = Arch Pathol Lab Med | volume = 128 | issue = 3 | pages = 355-6 | month = Mar | year = 2004 | doi = 10.1043/1543-2165(2004)128355:PQCTIP2.0.CO;2 | PMID = 14987144 }}</ref>


===Stains===
===Stains===
*Fontana-Masson stain +ve.<ref name=pmid10615019>{{Cite journal  | last1 = Sant'Ambrogio | first1 = S. | last2 = Connelly | first2 = J. | last3 = DiMaio | first3 = D. | title = Minocycline pigmentation of heart valves. | journal = Cardiovasc Pathol | volume = 8 | issue = 6 | pages = 329-32 | month =  | year =  | doi =  | PMID = 10615019 }}</ref>
*[[Fontana-Masson stain]] +ve.<ref name=pmid10615019>{{Cite journal  | last1 = Sant'Ambrogio | first1 = S. | last2 = Connelly | first2 = J. | last3 = DiMaio | first3 = D. | title = Minocycline pigmentation of heart valves. | journal = Cardiovasc Pathol | volume = 8 | issue = 6 | pages = 329-32 | month =  | year =  | doi =  | PMID = 10615019 }}</ref>
 
==Sclerosing mucoepidermoid carcinoma with eosinophilia==
{{Main|Sclerosing mucoepidermoid carcinoma with eosinophilia}}


=See also=
=See also=
Michael
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