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Difference between revisions of "Odontogenic tumours and cysts"
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Odontogenic tumours and cysts (view source)
Revision as of 18:57, 18 March 2013
, 18:57, 18 March 2013→Microscopic: re-work micro
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===Microscopic=== | ===Microscopic=== | ||
Features: <ref>Thompson LDR. Head and neck pathology - (Foundations in diagnostic pathology). Goldblum JR, Ed.. Churchill Livingstone. 2006. ISBN 0-443-06960-3.</ref> | Features: <ref>Thompson LDR. Head and neck pathology - (Foundations in diagnostic pathology). Goldblum JR, Ed.. Churchill Livingstone. 2006. ISBN 0-443-06960-3.</ref> | ||
*Stratified epithelium resembling squamous epithelium - | *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. | |||
*Parakeratosis (keratinized cells with nuclei) - '''key feature'''. | |||
*Artefactual separation of epithelium from the basement membrane. | *Artefactual separation of epithelium from the basement membrane. | ||
DDx: | DDx: | ||
*Odontogenic cyst. | *Odontogenic cyst. | ||
**Orthokeratinized 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]]. | ||
***Orthokeratosis = keratinized cells no nuclei; parakeratosis = keratinized cell with nuclei. | ***Orthokeratosis = keratinized cells no nuclei; parakeratosis = keratinized cell with nuclei. | ||