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| {{ Infobox diagnosis
| | #redirect [[Odontogenic keratocyst]] |
| | Name = {{PAGENAME}}
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| | Image = Keratocystic_odontogenic_tumour_-_intermed_mag.jpg
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| | Width =
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| | Caption = Keratocystic odontogenic tumour. [[H&E stain]].
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| | Synonyms = odontogenic keratocyst (old term)
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| | Micro = stratified epithelium with "ribbon-like appearance" with palisaded basal cell layer, parakeratosis, artefactual separation of epithelium from the basement membrane
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| | Subtypes =
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| | LMDDx = odontogenic cyst ([[dentigerous cyst]]), [[squamous cell carcinoma]]
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| | Stains =
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| | IHC =
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| | EM =
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| | Molecular =
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| | IF =
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| | Gross =
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| | Grossing =
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| | Site = usually mandible - see ''[[odontogenic tumours and cysts]]''
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| | Assdx =
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| | Syndromes = [[nevoid basal cell carcinoma syndrome]]
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| | Clinicalhx =
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| | Signs = mass lesion
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| | Symptoms =
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| | Prevalence = uncommon
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| | Bloodwork =
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| | Rads =
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| | Endoscopy =
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| | Prognosis =
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| | Other =
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| | ClinDDx = [[ameloblastoma]]
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| | Tx =
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| }}
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| {{ Infobox external links
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| | Name = {{PAGENAME}}
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| | EHVSC = 10179
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| | EHVSC_mult = {{EHVSC2|10178}}
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| | pathprotocols =
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| | wikipedia = keratocystic odontogenic tumour
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| | pathoutlines = {{Pathologyoutlines|topic/mandiblemaxillakeratocyst}}
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| | rosaicollection = 14023
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| }}
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| '''Keratocystic odontogenic tumour''', abbreviated '''KOT''', is an uncommon [[Odontogenic tumours and cysts|odontogenic tumour]].
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| It was previously known as '''odontogenic keratocyst''', abbreviated '''OKC'''.<ref name=pmid18353202>{{Cite journal | last1 = Madras | first1 = J. | last2 = Lapointe | first2 = H. | title = Keratocystic odontogenic tumour: reclassification of the odontogenic keratocyst from cyst to tumour. | journal = J Can Dent Assoc | volume = 74 | issue = 2 | pages = 165-165h | month = Mar | year = 2008 | doi = | PMID = 18353202 }}</ref>
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| ==General==
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| *May be associated with ''[[nevoid basal cell carcinoma syndrome]]''.
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| *Very rarely transforms to a [[squamous cell carcinoma]].<ref name=pmid21493332>{{Cite journal | last1 = Lee | first1 = JW. | last2 = Gates | first2 = R. | last3 = Wignall | first3 = A. | title = Squamous cell carcinoma arising from a keratocystic odontogenic tumor. | journal = Otolaryngol Head Neck Surg | volume = 145 | issue = 2 | pages = 356-7 | month = Aug | year = 2011 | doi = 10.1177/0194599811399270 | PMID = 21493332 }}</ref><ref name=pmid23374486>{{Cite journal | last1 = Tan | first1 = B. | last2 = Yan | first2 = TS. | last3 = Shermin | first3 = L. | last4 = Teck | first4 = KC. | last5 = Yoke | first5 = PC. | last6 = Goh | first6 = C. | last7 = Balakrishnan | first7 = A. | title = Malignant transformation of keratocystic odontogenic tumor: Two case reports. | journal = Am J Otolaryngol | volume = 34 | issue = 4 | pages = 357-61 | month = | year = | doi = 10.1016/j.amjoto.2013.01.002 | PMID = 23374486 }}</ref>
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| ===Clinical===
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| Features:<ref name=pmid17928730>{{Cite journal | last1 = Habibi | first1 = A. | last2 = Saghravanian | first2 = N. | last3 = Habibi | first3 = M. | last4 = Mellati | first4 = E. | last5 = Habibi | first5 = M. | title = Keratocystic odontogenic tumor: a 10-year retrospective study of 83 cases in an Iranian population. | journal = J Oral Sci | volume = 49 | issue = 3 | pages = 229-35 | month = Sep | year = 2007 | doi = | PMID = 17928730 }}</ref>
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| *Most common presentation: swelling.
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| ==Gross==
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| *Location: usually mandible.
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| *May mimic [[ameloblastoma]] radiologically.
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| ==Microscopic==
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| Features: <ref>Thompson LDR. Head and neck pathology - (Foundations in diagnostic pathology). Goldblum JR, Ed.. Churchill Livingstone. 2006. ISBN 0-443-06960-3.</ref>
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| *Stratified epithelium (resembling squamous epithelium) with:
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| **"Ribbon-like appearance" - '''important'''.
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| ***Typically 8-10 cell layers thick - with relatively uniform thickness.
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| ***Lacks rete ridges.
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| **Palisaded basal cell layer.
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| *Parakeratosis (keratinized cells with nuclei) - '''key feature'''.
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| *Artefactual separation of epithelium from the basement membrane.
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| DDx:
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| *Odontogenic cyst.
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| **Orthokeratinized odontogenic cyst<ref name=pmid21062939>{{Cite journal | last1 = Macdonald-Jankowski | first1 = DS. | title = Orthokeratinized odontogenic cyst: a systematic review. | journal = Dentomaxillofac Radiol | volume = 39 | issue = 8 | pages = 455-67 | month = Dec | year = 2010 | doi = 10.1259/dmfr/19728573 | PMID = }}</ref> - usu. [[dentigerous cyst]] - has [[orthokeratosis]] instead of [[parakeratosis]].
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| ***Orthokeratosis = keratinized cells no nuclei; parakeratosis = keratinized cell with nuclei.
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| ===Images===
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| <gallery>
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| Image:Keratocystic_odontogenic_tumour_-_2_-_intermed_mag.jpg | KOT - intermed. mag. (WC)
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| Image:Keratocystic_odontogenic_tumour_-_2_-_very_high_mag.jpg | KOT - very high mag. (WC)
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| Image:Keratocystic_odontogenic_tumour_-_intermed_mag.jpg KOT - another case - intermed. mag. (WC)]
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| Image:Keratocystic_odontogenic_tumour1.jpg | KOT - poor quality. (WC)
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| Image:Keratocystic_odontogenic_tumour2.jpg | KOT - showing artefactual clefting - poor quality. (WC)
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| </gallery>
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| www:
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| *[http://ars.els-cdn.com/content/image/1-s2.0-S0968605305000992-gr5.jpg KOT (els-cdn.com)].<ref>URL: [http://www.sciencedirect.com/science/article/pii/S0968605305000992#fig5 http://www.sciencedirect.com/science/article/pii/S0968605305000992#fig5]. Accessed on: 11 March 2013.</ref>
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| ==See also==
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| *[[Odontogenic tumours and cysts]].
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| *[[Head and neck pathology]].
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| ==References==
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| {{Reflist|2}}
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| [[Category:Diagnosis]]
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| [[Category:Odontogenic tumours and cysts]]
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