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| Image: [http://www.lmp.ualberta.ca/resources/pathoimages/Images-C/000p039r.jpg Craniopharyngioma - micrograph (lmp.ualbera.ca)]. | | Image: [http://www.lmp.ualberta.ca/resources/pathoimages/Images-C/000p039r.jpg Craniopharyngioma - micrograph (lmp.ualbera.ca)]. |
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| ==Keratocystic odontogenic tumour== | | ==Odontogenic tumours and cysts== |
| ===General===
| | {{main|Odontogenic tumours and cysts}} |
| *Used to be known as ''odontogenic keratocyst''.<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 }}
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| </ref>
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| *May be associated with ''[[nevoid basal cell carcinoma syndrome]]''.
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| ===Clinical===
| | This is a rather large topic and dealt with in a separate article. |
| 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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| *Location: usually mandible.
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| *May mimic ameloblastoma radiologically.
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| ===Microscopic===
| | It includes: |
| Features: <ref>Thompson LDR. Head and neck pathology - (Foundations in diagnostic pathology). Goldblum JR, Ed.. Churchill Livingstone. 2006. ISBN 0-443-06960-3.</ref>
| | *Keratocystic odontogenic tumour. |
| * Stratified epithelium resembling squamous epithelium -- but:
| | *Ameloblastoma. |
| ** Lacks [[rete ridges]].
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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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| Images:
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| *[http://commons.wikimedia.org/wiki/File:Keratocystic_odontogenic_tumour1.jpg KOT (WC)]. | |
| *[http://commons.wikimedia.org/wiki/File:Keratocystic_odontogenic_tumour2.jpg KOT - showing artefactual separation of epithelium (WC)]. | |
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| ==Ameloblastoma==
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| ===General===
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| *Osteous lesion.
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| ===Microscopic===
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| Features:<ref>URL: [http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675%2806%2970616-7 http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675%2806%2970616-7]. Accessed on: March 9, 2010.</ref>
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| *Stellate reticulum - star-shaped cells, found in a developing tooth.<ref>URL: [http://en.wikipedia.org/wiki/Stellate_reticulum http://en.wikipedia.org/wiki/Stellate_reticulum]. Accessed on: March 9, 2010.</ref>
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| *Tall columnar cells.
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| **Nuclei distant from the basement membrane (reverse polarization of the nuclei).
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| *+/-Giant cells.
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| Images:
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| *[http://www.estomatologia.com.br/diagnosticos_det2.asp?cod_diag=12 Ameloblastoma - several images (estomatologia.com.br)].
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| *[http://www.cytochemistry.net/microanatomy/digestive/devtooth9.jpg Stellate reticulum (cytochemistry.net)].
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| ==Nasal polyps== | | ==Nasal polyps== |