Difference between revisions of "Keratocystic odontogenic tumour"
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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 | | Micro = Stratified epithelium with "ribbon-like appearance" with palisaded basal cell layer, parakeratosis, artefactual separation of epithelium from the basement membrane | ||
| Subtypes = | | Subtypes = | ||
| LMDDx = [[ | | LMDDx = odontogenic cyst ([[dentigerous cyst]]), [[squamous cell carcinoma]] | ||
| Stains = | | Stains = | ||
| IHC = | | IHC = | ||
| Line 60: | Line 60: | ||
DDx: | DDx: | ||
* | *Odontogenic cyst. | ||
**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]]. | **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]]. | ||
***Orthokeratosis = keratinized cells no nuclei; parakeratosis = keratinized cell with nuclei. | ***Orthokeratosis = keratinized cells no nuclei; parakeratosis = keratinized cell with nuclei. | ||
Revision as of 18:34, 26 July 2013
| Keratocystic odontogenic tumour | |
|---|---|
| Diagnosis in short | |
 Keratocystic odontogenic tumour. H&E stain. | |
|
| |
| LM | Stratified epithelium with "ribbon-like appearance" with palisaded basal cell layer, parakeratosis, artefactual separation of epithelium from the basement membrane |
| LM DDx | odontogenic cyst (dentigerous cyst), squamous cell carcinoma |
| Site | usually mandible |
|
| |
| Syndromes | nevoid basal cell carcinoma syndrome |
|
| |
| Signs | mass lesion |
| Prevalence | uncommon |
| Clin. DDx | ameloblastoma |
| Keratocystic odontogenic tumour | |
|---|---|
| External resources | |
| EHVSC | 10179 |
Keratocystic odontogenic tumour, abbreviated KOT, is an uncommon odontogenic tumour.
It was previously known as odontogenic keratocyst, abbreviated OKC.[1]
General
- May be associated with nevoid basal cell carcinoma syndrome.
Clinical
Features:[2]
- Most common presentation: swelling.
Gross
- Location: usually mandible.
- May mimic ameloblastoma radiologically.
Microscopic
Features: [3]
- Stratified epithelium (resembling squamous epithelium) with:
- "Ribbon-like appearance" - important.
- Typically 8-10 cell layers thick - with relatively uniform thickness.
- Lacks rete ridges.
- Palisaded basal cell layer.
- "Ribbon-like appearance" - important.
- Parakeratosis (keratinized cells with nuclei) - key feature.
- Artefactual separation of epithelium from the basement membrane.
DDx:
- Odontogenic cyst.
- Orthokeratinized odontogenic cyst[4] - usu. dentigerous cyst - has orthokeratosis instead of parakeratosis.
- Orthokeratosis = keratinized cells no nuclei; parakeratosis = keratinized cell with nuclei.
- Orthokeratinized odontogenic cyst[4] - usu. dentigerous cyst - has orthokeratosis instead of parakeratosis.
Images
KOT - intermed. mag. (WC)
KOT - very high mag. (WC)
KOT - poor quality. (WC)
KOT - showing artefactual clefting - poor quality. (WC)
www:
See also
References
- ↑ Madras, J.; Lapointe, H. (Mar 2008). "Keratocystic odontogenic tumour: reclassification of the odontogenic keratocyst from cyst to tumour.". J Can Dent Assoc 74 (2): 165-165h. PMID 18353202.
- ↑ Habibi, A.; Saghravanian, N.; Habibi, M.; Mellati, E.; Habibi, M. (Sep 2007). "Keratocystic odontogenic tumor: a 10-year retrospective study of 83 cases in an Iranian population.". J Oral Sci 49 (3): 229-35. PMID 17928730.
- ↑ Thompson LDR. Head and neck pathology - (Foundations in diagnostic pathology). Goldblum JR, Ed.. Churchill Livingstone. 2006. ISBN 0-443-06960-3.
- ↑ Macdonald-Jankowski, DS. (Dec 2010). "Orthokeratinized odontogenic cyst: a systematic review.". Dentomaxillofac Radiol 39 (8): 455-67. doi:10.1259/dmfr/19728573.
- ↑ URL: http://www.sciencedirect.com/science/article/pii/S0968605305000992#fig5. Accessed on: 11 March 2013.