Difference between revisions of "Odontogenic tumours and cysts"

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==Ameloblastoma==
==Ameloblastoma==
===General===
{{Main|Ameloblastoma}}
*Osteous lesion.
*Usually mandible.<ref>URL: [http://www.waent.org/archives/2010/Vol3-2/20100618-ameloblastoma/jaw-tumor.htm http://www.waent.org/archives/2010/Vol3-2/20100618-ameloblastoma/jaw-tumor.htm]. Accessed on: 30 November 2011.</ref>
**In a review of 3677 cases, the mandible-to-maxilla ratio was 5 to 1.<ref name=pmid7633291>{{Cite journal  | last1 = Reichart | first1 = PA. | last2 = Philipsen | first2 = HP. | last3 = Sonner | first3 = S. | title = Ameloblastoma: biological profile of 3677 cases. | journal = Eur J Cancer B Oral Oncol | volume = 31B | issue = 2 | pages = 86-99 | month = Mar | year = 1995 | doi =  | PMID = 7633291 }}</ref>
*May arise from an odontogenic cyst,<ref name=pmid10587275>{{Cite journal  | last1 = Eversole | first1 = LR. | title = Malignant epithelial odontogenic tumors. | journal = Semin Diagn Pathol | volume = 16 | issue = 4 | pages = 317-24 | month = Nov | year = 1999 | doi =  | PMID = 10587275 }}</ref> e.g. [[dentigerous cyst]].<ref name=pmid21957386>{{Cite journal  | last1 = Moosvi | first1 = Z. | last2 = Tayaar | first2 = SA. | last3 = Kumar | first3 = GS. | title = Neoplastic potential of odontogenic cysts. | journal = Contemp Clin Dent | volume = 2 | issue = 2 | pages = 106-9 | month = Apr | year = 2011 | doi = 10.4103/0976-237X.83073 | PMID = 21957386 | PMC = 3180832 }}</ref>
 
===Classification===
Location:
#Intra-osseous.
#*Locally aggressive.
#Peripheral.
#*Benign.
 
====Subclassification of intra-osseous type====
Histology:
#Solid/multicystic.
#*More commonly reoccur.
#Unicystic.
#*Unlikely to reoccur.
#*Classically found in younger individuals.
 
===Microscopic===
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>
*Stellate reticulum - star-shaped cells, found in a developing tooth.
*Tall columnar cells.
**Palisaded nuclei with reverse polarization.
***Reverse polarization of nuclei = nuclei distant from the basement membrane/nuclei at pole opposite of basement membrane.
***Palisaded nuclei = picket fence appearance; columnar-shaped nuclei with long axis perpendicular to the basement membrane -- '''key feature'''.
**Subnuclear vacuolization.
*+/-Giant cells.
*+/-Subepithelial hyalinization (eosinophilic acellular amorphous material).
**Seen deep to the basement membrane.
*Variable morphology (see below - ''morphology'').
 
DDx (nuclear palisading):
*[[Adenomatoid odontogenic tumour]].
*[[Ameloblastic fibroma]].
 
====Images====
www:
*[http://www.estomatologia.com.br/diagnosticos_det2.asp?cod_diag=12 Ameloblastoma - several images (estomatologia.com.br)].
*[http://www.cytochemistry.net/microanatomy/digestive/devtooth9.jpg Stellate reticulum (cytochemistry.net)].
 
<gallery>
Image: Ameloblastoma - low mag.jpg | Ameloblastoma - low mag. (WC)
Image: Ameloblastoma - intermed mag.jpg | Ameloblastoma - intermed. mag. (WC)
Image: Ameloblastoma - high mag.jpg | Ameloblastoma - high mag. (WC)
Image: Ameloblastoma - very high mag.jpg | Ameloblastoma - very high mag. (WC)
</gallery>
 
====Morphology====
*Not prognostic.
 
Morphologic variants:
*Follicular ameloblastoma  (classic appearance).
*Plexiform ameloblastoma (does not have prominent palisading).
*Acanthomatous ameloblastoma.
*Desmoplastic ameloblastoma.
*Basaloid ameloblastoma.


==Adenomatoid odontogenic tumour==
==Adenomatoid odontogenic tumour==
===General===
{{Main|Adenomatoid odontogenic tumour}}
*Paedatric population.
 
===Microscopic===
Features:
*Palisaded nuclei.
*Whorled epithelium.
 
Notes:
*No stellate reticulum.
 
DDx:
*[[Ameloblastoma]].
 
Image:
*[http://www.surgicalpathologyatlas.com/glfusion/mediagallery/media.php?f=0&sort=0&s=20080802170145276 AOT (surgical pathologyatlas.com)].


==Ameloblastic fibroma==
==Ameloblastic fibroma==
Line 228: Line 155:
Features:
Features:
*Paucicellular lesion with pale staining.
*Paucicellular lesion with pale staining.
==Squamous odontogenic tumour==
{{Main|Squamous odontogenic tumour}}


=See also=
=See also=

Latest revision as of 00:54, 24 March 2019

This article covers odontogenic tumours and cysts, which is a subset of oral pathology and can be grouped under the heading of head and neck pathology.

The general topic of head and neck pathology is covered in the head and neck pathology and head and neck cytopathology articles.

The vast majority of oral malignancies are squamous cell carcinoma. Common odontogenic cysts are dentigerous cysts, and radicular cysts.[1]

Tooth histology 101

Teeth develop from a combination of:

  1. Epithelium (downward growth).
  2. Mesenchyme.

Identifying stuff

Pulp:

  • Paucicellular.
  • Pale staining.

Enamel:

  • Hyperchromatic (dark purple).
  • "Fish scale" appearance.

Image:

  • Tooth. (WC)

Enamel 101

  • Arises from reduced enamel epithelium.

Reduced enamel epithelium

Microscopic

Features:

  • Bilayered epithelium consisting of:
    • Cuboidal/columnar cells with:
      • Moderate eosinophilic cytoplasm.
      • Round (slightly irregular) centrally place nuclei.

Notes:

  • Transforms into squamous epithelium. (???)

Specific entities

Odontoma

General

  • Usually diagnosed clinically.
  • Benign.
  • Most common odontogenic tumour - considered to be a hamartoma.[2]
  • Etiology unknown.[3]
  • Typically first two decades of life.

Classification:[2]

  • Compound odontoma - tooth-like structure.
  • Complex odontoma - disorganized mass of odontogenic tissues.

Microscopic

Features:[2]

  • Dentin.
  • Cementum.
  • Pulpal tissue.
  • Enamel - has a "fish-scale" appearance.
    • Usually lost during decalcificiation.

Images:

Radicular cyst

  • AKA periapical cyst.

Clinical

  • Non-vital tooth - key feature.
    • The tooth that has lost its nerve.

Microscopic

Features:

  • Squamous epithelium - non-keratinized - important.
  • +/-Giant cells.
  • +/-Cholesterol clefts.
  • +/-Abundant plasma cells.

DDx:

Dentigerous cyst

General

  • Unerupted tooth - usually wisdom teeth.
    • Young adults.

Treatment:

Gross

  • Lesion at crown of tooth.

Microscopic

Features:

  • Squamous epithelium.
    • Classically described as non-keratinized - in which case the diagnosis is straight forward - important.
    • Approximately half have keratin.[6]
  • +/-Giant cells.
  • +/-Cholesterol clefts.

DDx:

Images:

Sign out

Keratinized

MAXILLARY SINUS CYST, LEFT, EXCISION:
- ACANTHOTIC STRATIFIED SQUAMOUS EPITHELIUM WITH INFLAMMATION, COMPACT
KERATIN AND FOCAL PARAKERATOSIS -- CONSISTENT WITH DENTIGEROUS CYST WITH KERATIN.
- BENIGN BONE.
- NEGATIVE FOR ODONTOGENIC KERATOCYSTIC TUMOUR (ODONTOGENIC KERATOCYST).

Keratocystic odontogenic tumour

Main article: Keratocystic odontogenic tumour

Ameloblastoma

Main article: Ameloblastoma

Adenomatoid odontogenic tumour

Main article: Adenomatoid odontogenic tumour

Ameloblastic fibroma

General

  • Paedatric population.

Microscopic

Features:

  • Palisaded nuclei.
  • Fibrous stroma.

Notes:

  • No stellate reticulum.

DDx:

Odontogenic myxoma

General

  • Benign tumour of mesenchymal origin.
  • Often reoccurs.
  • Radiologic DDx includes ameloblastoma.

Gross

  • Gelatinous mass.

Microscopic

Features:

  • Paucicellular lesion with pale staining.

Squamous odontogenic tumour

Main article: Squamous odontogenic tumour

See also

References

  1. ↑ Eichhorn, W.; Wehrmann, M.; Blessmann, M.; Pohlenz, P.; Blake, F.; Schmelzle, R.; Heiland, M. (Apr 2010). "Metastases in odontogenic cysts: literature review and case presentation.". Oral Surg Oral Med Oral Pathol Oral Radiol Endod 109 (4): 582-6. doi:10.1016/j.tripleo.2009.11.013. PMID 20303056.
  2. ↑ 2.0 2.1 2.2 2.3 Nelson, BL.; Thompson, LD. (Dec 2010). "Compound odontoma.". Head Neck Pathol 4 (4): 290-1. doi:10.1007/s12105-010-0186-2. PMID 20533004.
  3. ↑ Yadav, M.; Godge, P.; Meghana, SM.; Kulkarni, SR. (Apr 2012). "Compound odontoma.". Contemp Clin Dent 3 (Suppl 1): S13-5. doi:10.4103/0976-237X.95095. PMID 22629054.
  4. ↑ Dhanrajani, PJ.; Abdulkarim, SA.. "Multiple myeloma presenting as a periapical lesion in the mandible.". Indian J Dent Res 8 (2): 58-61. PMID 9495138.
  5. ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 748. ISBN 978-1416031215.
  6. ↑ Yoshiura, K.; Higuchi, Y.; Araki, K.; Shinohara, M.; Kawazu, T.; Yuasa, K.; Tabata, O.; Kanda, S. (Jun 1997). "Morphologic analysis of odontogenic cysts with computed tomography.". Oral Surg Oral Med Oral Pathol Oral Radiol Endod 83 (6): 712-8. PMID 9195629.
  7. ↑ Moosvi, Z.; Tayaar, SA.; Kumar, GS. (Apr 2011). "Neoplastic potential of odontogenic cysts.". Contemp Clin Dent 2 (2): 106-9. doi:10.4103/0976-237X.83073. PMC 3180832. PMID 21957386. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3180832/.

External

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