|
|
(198 intermediate revisions by the same user not shown) |
Line 1: |
Line 1: |
| '''Head and neck pathology''' is squamous cell carcinoma and weird stuff. The [[thyroid]] is dealt with in its own article, as is pathology of the [[salivary gland]]. | | This article is '''an introduction to head and neck pathology'''. Most of head and neck pathology is squamous cell carcinoma and its variants. |
| | |
| | The [[thyroid gland]] is dealt with in its own article, as is pathology of the [[salivary gland]]. |
|
| |
|
| Cytopathology of the head and neck is dealt with in a separate article called ''[[head and neck cytopathology]]''. | | Cytopathology of the head and neck is dealt with in a separate article called ''[[head and neck cytopathology]]''. |
|
| |
|
| ==Clinical== | | =Anatomy= |
| ===Oral lesions=== | | [[Image:Blausen_0872_UpperRespiratorySystem.png|thumb|Head and neck anatomy (BruceBlaus/WC).]] |
| DDx:<ref name=Ref_PBoD780>{{Ref PBoD|780}}</ref>
| | *Oropharynx - includes: tonsil, tonsillar pillar, base of tongue, soft palate.<ref>URL: [https://www.cancer.org/cancer/oral-cavity-and-oropharyngeal-cancer/about/what-is-oral-cavity-cancer.html https://www.cancer.org/cancer/oral-cavity-and-oropharyngeal-cancer/about/what-is-oral-cavity-cancer.html]. Accessed on: 1 April 2021.</ref><ref>URL: [http://www.headandneckcancerguide.org/teens/cancer-basics/explore-cancer-types/throat-cancer/oropharyngeal-cancer/soft-palate-cancer/ http://www.headandneckcancerguide.org/teens/cancer-basics/explore-cancer-types/throat-cancer/oropharyngeal-cancer/soft-palate-cancer/]. Accessed on: 15 November 2016.</ref> |
| *Leukoplakia. | | *Oral cavity - includes floor of mouth, bucca, anterior 2/3 of tongue,<ref>URL: [http://www.headandneckcancerguide.org/teens/cancer-basics/explore-cancer-types/oral-cancers/tongue-cancer/ http://www.headandneckcancerguide.org/teens/cancer-basics/explore-cancer-types/oral-cancers/tongue-cancer/]. Accessed on: 15 November 2016.</ref> lips, [[hard palate]], upper & lower alveolar ridge, retromolar trigone.<ref>URL: [http://www.headandneckcancerguide.org/teens/cancer-basics/explore-cancer-types/oral-cancers/oromandibular-cancer/ http://www.headandneckcancerguide.org/teens/cancer-basics/explore-cancer-types/oral-cancers/oromandibular-cancer/]. Accessed on: 15 November 2016.</ref> |
| **Unidentified white lesion. | | *Laryngopharynx. |
| **More worrisome than erythroplakia. | | *Nasopharynx. |
| **Often assoc. with epithelial thickening (hyperkeratosis, acanthosis). | | |
| *Erythroplakia. | | =Clinical= |
| **Unidentified red lesion. | | Common lesions:<ref name=Ref_PBoD780>{{Ref PBoD|780}}</ref> |
| **Often erosion. | | *[[Leukoplakia]]. |
| | **Homogeneous. |
| | **Non-homogeneous. |
| | *Erythroplakia - more worrisome for cancer than leukoplakia. |
| | |
| | ==Leukoplakia== |
| | :''[[Hairy leukoplakia]] is dealt with in a separate section''. |
| | :''The typical [[benign leukoplakia]] is dealt with in a separate section''. |
| | {{Main|Leukoplakia}} |
| | |
| | ==Erythroplakia== |
| | ===General=== |
| | *Non-specific clinical finding - may be benign or [[malignant]]. |
| | *Strong association with non-keratinizing squamous lesions (invasive and dysplastic). |
| | |
| | ===Microscopic=== |
| | Features:<ref name=Ref_PBoD780>{{Ref PBoD|780}}</ref> |
| | *Unidentified red lesion. |
| | *Often [[erosion]]. |
| | |
| | =Overview= |
| | ==Cysts== |
| | *[[Rathke cleft cyst]] - nasal cavity. |
| | *[[Thyroglossal duct cyst]] - midline, neck. |
| | *[[Branchial cleft cyst]] - lateral neck. |
| | |
| | ==Larynx== |
| | *[[Vocal cord nodule]]. |
| | *[[Laryngeal papilloma]]. |
| | |
| | ==Oral== |
| | {{Main|Oral pathology}} |
| | Infectious: |
| | *[[Hairy leukoplakia]]. |
| | *[[Oral candidiasis]]. |
| | |
| | Other: |
| | *[[Pemphigus vulgaris]]. |
| | |
| | Vascular: |
| | *[[Pyogenic granuloma]]. |
| | |
| | Pigmentation: |
| | *Focal: |
| | **[[Amalgam tattoo]]. |
| | **[[Melanocytic lesions]]. |
| | ***[[Melanotic macule]]. |
| | ***[[Blue nevus]]. |
| | ***[[Malignant melanoma]] |
| | *Diffuse |
| | **[[Peutz-Jeghers syndrome]]. |
| | **[[Addison's disease]]. |
| | |
| | ==Nasal cavity/nose== |
| | *[[Rhinoscleroma]]. |
| | *Nasal glial heterotopia.<ref>{{Cite journal | last1 = Penner | first1 = CR. | last2 = Thompson | first2 = L. | title = Nasal glial heterotopia: a clinicopathologic and immunophenotypic analysis of 10 cases with a review of the literature. | journal = Ann Diagn Pathol | volume = 7 | issue = 6 | pages = 354-9 | month = Dec | year = 2003 | doi = | PMID = 15018118 }}</ref> |
| | |
| | =Benign cystic lesions= |
| | :Cytology dealt with in ''[[Head and neck cytopathology]]''. |
| | |
| | ===Cystic lesions - overview=== |
| | Lateral cystic lesions: |
| | *[[Branchial cleft cyst]]. |
| | *[[Cystic hygroma]]. |
| | |
| | Medial cystic lesions: |
| | *[[Thyroglossal duct cyst]]. |
| | |
| | Lateral & medial lesions: |
| | *[[Epidermoid cyst]]. |
| | *Cystic [[squamous cell carcinoma]]. |
|
| |
|
| =Benign=
| |
| ==Rathke cleft cyst== | | ==Rathke cleft cyst== |
| :{{Main|Rathke cleft cyst}} | | :{{Main|Rathke cleft cyst}} |
Line 21: |
Line 92: |
| *Related to ''[[craniopharyngioma]]''. | | *Related to ''[[craniopharyngioma]]''. |
|
| |
|
| ==Pemphigus vulgaris== | | ==Thyroglossal duct cyst== |
| *See the ''[[bullous disease]]'' article.
| | {{Main|Thyroglossal duct cyst}} |
|
| |
|
| ===General=== | | ==Branchial cleft cyst== |
| *[[AKA]] ''pemphigus''. | | *[[AKA]] ''branchial cleft remnant''. |
| **Should not be confused with ''bullous pemphigoid'' (which is less serious).
| | {{Main|Branchial cleft cyst}} |
| *May lead to blindness.
| |
| *Oral lesion is classically: ''first to show & last to go''.
| |
| **Oral lesions usually precede the skin lesions.
| |
|
| |
|
| ===Etiology=== | | ==Benign lymphoepithelial lesion== |
| *Autoimmune disease | | *[[AKA]] ''benign lymphoepithelial cyst'' |
| *Antibodies: desmoglein 1, desmoglein 3.
| | {{Main|Benign lymphoepithelial lesion}} |
|
| |
|
| ==Pyogenic granuloma== | | =Other benign= |
| ===General=== | | ==Vocal cord nodule== |
| *Sometimes ''pregnancy tumour''. | | *[[AKA]] ''singer's nodule''. |
| *Seen in children, young adults, pregnant women. | | *[[AKA]] ''vocal cord polyp''. |
| | {{Main|Vocal cord nodule}} |
|
| |
|
| ===Gross=== | | ==Squamous papilloma== |
| Features:<ref name=Ref_PBoD776>{{Ref PBoD|776}}</ref>
| | :Caruncle lesion is dealt with in ''[[papilloma of the caruncle]]''. |
| *Erythematous.
| | :The lesion in the [[esophagus]] is dealt with in ''[[squamous papilloma of the esophagus]]''. |
| *Hemorrhagic.
| | {{Main|Squamous papilloma}} |
|
| |
|
| ===Microscopic=== | | ==Pemphigus vulgaris== |
| Features:<ref name=Ref_PBoD775>{{Ref PBoD|775}}</ref>
| | {{Main|Pemphigus vulgaris}} |
| *Vascular. | | *[[AKA]] ''pemphigus''. |
| *Peduncular lesion. | | **Should not be confused with ''[[bullous pemphigoid]]'' (which is less serious). |
|
| |
|
| DDx:
| | ==Pyogenic granuloma== |
| *Capillary hemangioma.
| | *[[AKA]] ''lobular capillary hemangioma''.<ref name=pmid21839350>{{Cite journal | last1 = Baglin | first1 = AC. | title = [Vascular tumors and pseudotumors. Pyogenic granuloma (lobular capillary hemangioma)]. | journal = Ann Pathol | volume = 31 | issue = 4 | pages = 266-70 | month = Aug | year = 2011 | doi = 10.1016/j.annpat.2011.05.014 | PMID = 21839350 }}</ref> |
| | | {{Main|Lobular capillary hemangioma}} |
| ==Hairy leukoplakia== | |
| ===General===
| |
| Features:<ref name=Ref_PBoD777>{{Ref PBoD|777}}</ref>
| |
| *Oral lesion.
| |
| **Often on tongue.
| |
| *Thought to be caused by EBV.
| |
| | |
| Gross:
| |
| *White confluent patches (icing sugar).
| |
| | |
| ===Microscopic=== | |
| Features:<ref>URL: [http://www.pathologyoutlines.com/oralcavity.html#hairyleukoplakia http://www.pathologyoutlines.com/oralcavity.html#hairyleukoplakia].</ref>
| |
| *Hyperkeratosis (thicker stratum corneum).<ref>URL: [http://www.emedicine.com/asp/dictionary.asp?keyword=hyperkeratosis http://www.emedicine.com/asp/dictionary.asp?keyword=hyperkeratosis].</ref>
| |
| *Acanthosis (thicker stratum spinosum).<ref>URL: [http://www.emedicine.com/asp/dictionary.asp?keyword=acanthosis http://www.emedicine.com/asp/dictionary.asp?keyword=acanthosis].</ref>
| |
| *"Balloon cells" in upper stratum spinosum - perinuclear clearing.
| |
|
| |
|
| ==Plummer-Vinson syndrome== | | ==Plummer-Vinson syndrome== |
| Triad:<ref name=Ref_PBoD776>{{Ref PBoD|776}}</ref> | | Triad:<ref name=Ref_PBoD776>{{Ref PBoD|776}}</ref> |
| *Iron-deficiency anemia. | | *Iron-deficiency [[anemia]]. |
| *Glossitis. | | *Glossitis. |
| *Esophageal dysphagia (usually related to webs). | | *Esophageal dysphagia (usually related to webs). |
|
| |
|
| ==Oral candidiasis== | | ==Rhinoscleroma== |
| *Fungus.
| | {{Main|Rhinoscleroma}} |
| *May be associated with immunodeficiency, e.g. [[AIDS]], organ transplant/immunosuppression.
| |
| | |
| Forms:<ref name=Ref_PBoD777>{{Ref PBoD|777}}</ref>
| |
| *Pseudomembranous (thrush).
| |
| *Erythematous.
| |
| *Hyperplastic.
| |
|
| |
|
| =Neoplasms= | | =Neoplasms= |
Line 91: |
Line 139: |
|
| |
|
| It includes: | | It includes: |
| *Keratocystic odontogenic tumour. | | *[[Keratocystic odontogenic tumour]]. |
| *Radicular cyst. | | *[[Radicular cyst]]. |
| *Dentigerous cyst. | | *[[Dentigerous cyst]]. |
| *Ameloblastoma. | | *[[Ameloblastoma]]. |
| *Adenomatoid odontogenic tumour. | | *[[Adenomatoid odontogenic tumour]]. |
| *Ameloblastic fibroma. | | *[[Ameloblastic fibroma]]. |
| *Odontogenic myxoma. | | *[[Odontogenic myxoma]]. |
|
| |
|
| ==Pharyngeal/nasopharyngeal specimens== | | ==Pharyngeal/nasopharyngeal specimens== |
Line 108: |
Line 156: |
|
| |
|
| Work-up of negative H&E Bx differs by site: | | Work-up of negative H&E Bx differs by site: |
| *Sunnybrook:<ref>S. Raphael</ref> | | *One large hospital: |
| **[[LMWK]] ([[CAM5.2]]). | | **LMWK (CAM5.2). |
| **[[pankeratin]] ([[AE1/AE3]]). | | **Pankeratin ([[AE1/AE3]]). |
| *UHN. | | *Another large hospital: |
| **Nothing. | | **Nothing. |
| | |
| | ==Laryngeal neoplasms== |
| | {{Main|Laryngeal carcinoma}} |
| | These are dealt with in a separate article. |
| | |
| | ==Human papillomavirus-associated head and neck squamous cell carcinoma== |
| | *Abbreviated ''HPV-HNSCC''. |
| | {{Main|Human papillomavirus-associated head and neck squamous cell carcinoma}} |
| | |
| | ==Sinonasal undifferentiated carcinoma== |
| | *Abbreviated ''SNUC''. |
| | {{Main|Sinonasal undifferentiated carcinoma}} |
|
| |
|
| ==Nasopharyngeal carcinoma== | | ==Nasopharyngeal carcinoma== |
| ===General===
| | *Abbreviated ''NPC''. |
| *"Nasopharyngeal carcinoma" is the name of an entity - it is not a descriptive term. | | {{Main|Nasopharyngeal carcinoma}} |
| *Strong association of EBV.
| |
| | |
| ===Microscopic===
| |
| Features:<ref>{{Ref Klatt|145}}</ref>
| |
| *Prominent lymphoid component - '''key feature'''.
| |
| *Features of squamous cell carcinoma:
| |
| **Cohesive cells with:
| |
| ***Abundant dense eosinophilic cytoplasm.
| |
| ***Central nuclei with small/indistinct nucleoli.
| |
|
| |
|
| ==Squamous lesions== | | ==Squamous lesions== |
Line 139: |
Line 190: |
| **There are several subtypes of SCC. | | **There are several subtypes of SCC. |
|
| |
|
| ==Squamous cell carcinoma== | | ==Squamous dysplasia of the head and neck== |
| ===General===
| | {{Main|Squamous dysplasia of the head and neck}} |
| *Most common tumour of the head & neck.
| |
| | |
| ===Microscopic===
| |
| ====Classification====
| |
| SCC is subdivided by the WHO into:<ref name=Ref_Sternberg4_975>{{Ref Sternberg4|975}}</ref>
| |
| *Keratinizing type (KT).
| |
| **Worst prognosis.
| |
| *Undifferentiated type (UT).
| |
| **Intermediate prognosis.
| |
| **EBV association.
| |
| *Nonkeratinizing type (NT).
| |
| **Good prognosis.
| |
| **EBV association.
| |
| | |
| Features based on classification:<ref name=Ref_Sternberg4_975>{{Ref Sternberg4|975}}</ref>
| |
| *KT subtype:
| |
| **Keratinization & intercellular bridges through-out most of the malignant lesion.
| |
| *UT:
| |
| **Non-distinct borders/syncytial pattern.
| |
| **Nucleoli.
| |
| *NT:
| |
| **Well-defined cell borders.
| |
| | |
| ====Invasion====
| |
| Features:
| |
| *Eosinophilia.
| |
| *Extra large nuclei/bizarre nuclei.
| |
| *Inflammation (lymphocytes, plasma cells).
| |
| *Long rete ridges.
| |
| *Numerous beeds/blobs of epithelial cells that seem unlikely to be rete ridges.
| |
| | |
| Pitfalls:
| |
| *Tangential cuts.
| |
| **If you can trace the squamous cells from a gland to the surface it is less likely to be invasive cancer.
| |
| | |
| Notes on invasion:
| |
| *Nice review paper by ''Wenig''.<ref name=pmid11904340>{{cite journal |author=Wenig BM |title=Squamous cell carcinoma of the upper aerodigestive tract: precursors and problematic variants |journal=Mod. Pathol. |volume=15 |issue=3 |pages=229–54 |year=2002 |month=March |pmid=11904340 |doi=10.1038/modpathol.3880520 |url=http://www.nature.com/modpathol/journal/v15/n3/pdf/3880520a.pdf}}</ref>
| |
| *See ''[[SCC of the cervix versus CIN III]]''.
| |
| | |
| ===Overview of subtypes===
| |
| There are several subtypes:<ref>URL: [http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675%2806%2970297-2 http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675%2806%2970297-2]. Accessed on: March 9, 2010.</ref>
| |
| *Basaloid - poor prognosis, usu. diagnosed by recognition of typical SCC.
| |
| *Warty (Condylomatous).
| |
| *Verrucous - good prognosis, rare.
| |
| *Papillary.
| |
| *Lymphoepithelial, rare.
| |
| *Spindle cell, a common spindle cell lesion of the H&N.
| |
| | |
| ====Verrucous squamous cell carcinoma====
| |
| Features:
| |
| *Exophytic growth.
| |
| *Well-differentiated.
| |
| *"Glassy" appearance.
| |
| *Pushing border.
| |
| | |
| DDx: papilloma.
| |
| | |
| ====Spindle cell squamous carcinoma====
| |
| *Key to diagnosis is finding a component of conventional squamous cell carcinoma.
| |
| | |
| IHC:
| |
| *Typically keratin -ve.
| |
| *p63 +ve.
| |
| | |
| DDx:
| |
| *Spindle cell melanoma.
| |
| *Mesenchymal neoplasm.
| |
| | |
| ====Basaloid squamous cell carcinoma====
| |
| *May mimic ''adenoid cystic carcinoma''.
| |
| *Classically base of tongue.<ref>URL: [http://www.biomedcentral.com/1471-2407/6/146 http://www.biomedcentral.com/1471-2407/6/146]. Accessed on: March 9, 2010.</ref>
| |
| *Typically poor prognosis.
| |
| | |
| Features:
| |
| *Need keratinization. (???)
| |
| | |
| DDx:
| |
| *Neuroendocrine tumour.
| |
|
| |
|
| ====Lymphoepithelial (squamous cell) carcinoma==== | | ==Squamous cell carcinoma of the head and neck== |
| *Rare.
| | {{Main|Squamous cell carcinoma of the head and neck}} |
| *+/-EBV.
| |
|
| |
|
| ==Small cell anaplastic carcinoma== | | ==Small cell anaplastic carcinoma== |
Line 228: |
Line 200: |
|
| |
|
| DDx: | | DDx: |
| *Metastatic small cell carcinoma of the lung. | | *Metastatic [[small cell carcinoma]] of the lung. |
|
| |
|
| ==Granular cell tumour== | | ==Granular cell tumour== |
| {{Main|Granular cell tumour}} | | {{Main|Granular cell tumour}} |
| ===General===
| |
| *May mimic (well-differentiated) squamous cell carcinoma - histopathologically.
| |
| **There is a well-described phenomenon called ''pseudoepitheliomatous hyperplasia''.<ref name=pmid16487362>{{cite journal |author=Abu-Eid R, Landini G |title=Morphometrical differences between pseudo-epitheliomatous hyperplasia in granular cell tumours and squamous cell carcinomas |journal=Histopathology |volume=48 |issue=4 |pages=407–16 |year=2006 |month=March |pmid=16487362 |doi=10.1111/j.1365-2559.2006.02350.x |url=}}</ref>
| |
| *Usually a benign tumour.
| |
|
| |
| ===Microscopic===
| |
| Features:
| |
| *Large polygonal cells with abundant (eosinophilic) granular cytoplasm.
| |
|
| |
| Image:
| |
| *[http://commons.wikimedia.org/wiki/File:Granular_cell_tumor_%283%29_skin.jpg Granular cell tumour (WC)].
| |
|
| |
|
| ==Olfactory neuroblastoma== | | ==Olfactory neuroblastoma== |
| ===General===
| | :See also: ''[[neuroblastoma]]''. |
| *[[AKA]] ''esthesioneuroblastoma''. | | *[[AKA]] ''esthesioneuroblastoma''. |
| *Prognosis: poor. (???)
| | {{Main|Olfactory neuroblastoma}} |
| | |
| ===Microscopic===
| |
| Features:
| |
| *Small round (blue) cell tumour.
| |
|
| |
|
| ==Craniopharyngioma== | | ==Craniopharyngioma== |
Line 259: |
Line 216: |
|
| |
|
| ==Nasopharyngeal angiofibroma== | | ==Nasopharyngeal angiofibroma== |
| ===General===
| | :See also: ''[[Angiofibroma]]''. |
| *[[AKA]] ''juvenile nasopharyngeal angiofibroma''. | | *[[AKA]] ''juvenile nasopharyngeal angiofibroma''. |
| *Classical adolescent males with recurrent nose bleeds.
| | {{Main|Nasopharyngeal angiofibroma}} |
| | |
| ===Microscopic===
| |
| Features:<ref name=Ref_Klatt144>{{Ref Klatt|144}}</ref>
| |
| *Fibroblastic cells with plump (near cuboidal) nuclei.
| |
| *Fibrous stroma.
| |
| *Abundant capillaries.
| |
| | |
| Image: [http://en.wikipedia.org/wiki/File:Angiofibroma.jpg Angiofibroma (WP)].
| |
| | |
| =Nasal Polyps=
| |
| ==Overview==
| |
| DDx (benign - multiple):<ref name=emedicine994274>[http://emedicine.medscape.com/article/994274-overview http://emedicine.medscape.com/article/994274-overview]</ref>
| |
| *Autoimmune/idiopathic:
| |
| **Asthma.
| |
| **Allergic rhinitis.
| |
| **Churg-Strauss syndrome (AKA ''allergic granulomatous angiitis'') - considered a type of Polyarteritis nodosa (PAN).
| |
| ***Features: asthma, eosinophilia, granulomatous inflammation, necrotizing systemic vasculitis, and necrotizing glomerulonephritis.<ref name=emedicine333492>[http://emedicine.medscape.com/article/333492-overview http://emedicine.medscape.com/article/333492-overview]</ref>
| |
| **Nonallergic rhinitis with eosinophilia syndrome (NARES).
| |
| *Infectious:
| |
| **Fungal infection (with allergic component - ''AFS'' = allergic fungal sinusitis).
| |
| **Chronic rhinosinusitis.
| |
| *Genetic
| |
| **Primary ciliary dyskinesia.
| |
| **Cystic fibrosis.
| |
| *Associations:
| |
| **Alcohol intolerance ~ 50%.
| |
| **Aspirin intolerance - upto ~ 25%.
| |
| | |
| Tumours:
| |
| *Juvenile nasopharyngeal angiofibroma (young males).
| |
| *Nasopharyngeal carcinomas.
| |
| *Sarcomas.
| |
| *Hemangioma.
| |
| *Papilloma.
| |
| *Other.
| |
| | |
| ===Epidemiology===
| |
| *More commonly assoc. with nonallergic conditions.<ref name=emedicine994274/>
| |
| | |
| ===Treatment===
| |
| *Recurrent polyps: Functional endoscopic sinus surgery (FESS).
| |
| | |
| ==Allergic nasal polyp==
| |
| ===General===
| |
| *People with allergies.
| |
| | |
| ===Gross===
| |
| *Polypoid mass - several millimetres to centimetres in size.
| |
| | |
| ===Microscopic===
| |
| Features:<ref>{{Ref Klatt|144}}</ref>
| |
| *Normal respiratory epithelium.
| |
| *Stroma with:
| |
| **Edema.
| |
| **Eosinophils.
| |
| **+/-Other inflammatory cells (plasma cells, lymphocytes, neutrophils).
| |
| | |
| ==Tonsillar lymphangiomatous polyp==
| |
| ===Microscopic===
| |
| Features:<ref>http://www.nature.com/modpathol/journal/v13/n10/full/3880208a.html</ref>
| |
| *Polyp with lymph channels.
| |
| | |
| ==Schneiderian papilloma==
| |
| ===General===
| |
| *[[AKA]] ''Schneiderian polyp''.
| |
| *Lumpers vs. splitters debate about whether it is one entity or three.<ref name=pmid11904343>{{cite journal |author=Barnes L |title=Schneiderian papillomas and nonsalivary glandular neoplasms of the head and neck |journal=Mod. Pathol. |volume=15 |issue=3 |pages=279–97 |year=2002 |month=March |pmid=11904343 |doi=10.1038/modpathol.3880524 |url=http://www.nature.com/modpathol/journal/v15/n3/full/3880524a.html}}</ref>
| |
| | |
| [http://www.nature.com/modpathol/journal/v15/n3/fig_tab/3880524t1.html#figure-title Subclassification]:<ref name=pmid11904343/>
| |
| *Inverted - most common ~60-65%.
| |
| *Fungiform - less common ~ 30-35%.
| |
| *Oncocytic - least common ~5%.
| |
| | |
| ===Microscopic===
| |
| ====Inverted papilloma====
| |
| Features:<ref name=pmid11904343/>
| |
| *Well-demarcated epithelial islands in the stroma.
| |
| *+/-Neutrophils.
| |
| *+/-Surface keratinization.
| |
|
| |
|
| Notes:
| | ==Biphenotypic sinonasal sarcoma== |
| *May mimic invasive SCC. | | *[[AKA]] ''low grade sinonasal sarcoma with neural and myogenic features''. |
| | {{Main|Biphenotypic sinonasal sarcoma}} |
|
| |
|
| Images:
| | =Nasal polyps= |
| *[http://path.upmc.edu/cases/case32.html Inverted papilloma & verrucous carcinoma (upmc.edu)].
| | {{Main|Nasal polyps}} |
|
| |
|
| =See also= | | =See also= |