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Malignant epithelial odontogenic tumors.

L R Eversole1

  • 1Department of Pathology and Medicine, University of the Pacific School of Dentistry, San Francisco, CA 95115, USA.

Seminars in Diagnostic Pathology
|December 10, 1999
PubMed
Summary

Malignant epithelial odontogenic tumors are rare jaw cancers originating from tooth-forming tissues. Accurate diagnosis is crucial to differentiate them from metastatic carcinomas, guiding appropriate treatment.

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Area of Science:

  • Oral Pathology
  • Oncology
  • Head and Neck Surgery

Background:

  • Malignant epithelial odontogenic tumors are exceptionally rare neoplasms.
  • They originate from the epithelial components of the odontogenic apparatus, including rests of Malassez, reduced enamel epithelium, rests of Serres, and odontogenic cyst linings.
  • Distinguishing primary intraosseous carcinoma from metastatic disease is critical due to the higher prevalence of jaw metastases.

Purpose of the Study:

  • To present specific histopathologic features for diagnosing primary carcinomas of odontogenic epithelium.
  • To review the differential diagnosis of odontogenic carcinomas, including ameloblastoma, ameloblastic carcinoma, primary intraosseous squamous cell carcinoma, clear cell odontogenic carcinoma, and malignant epithelial ghost cell tumor.
  • To highlight the role and limitations of immunohistochemical staining in the diagnosis of these rare tumors.

Main Methods:

  • Review of histopathologic features of various malignant epithelial odontogenic tumors.
  • Discussion of differential diagnostic criteria, emphasizing exclusion of metastatic carcinoma.
  • Evaluation of immunohistochemical (IHC) staining utility, particularly for clear cell odontogenic carcinoma.

Main Results:

  • Specific histopathologic characteristics aid in diagnosing primary odontogenic carcinomas.
  • Immunohistochemical staining is valuable for differentiating clear cell odontogenic carcinoma from metastatic renal cell carcinoma.
  • Most odontogenic carcinomas exhibit low molecular weight cytokeratin positivity, limiting IHC utility for other types within this group.
  • Aggressive behavior, including nodal and distant metastases, is common across these entities.

Conclusions:

  • Accurate histopathologic evaluation is essential for diagnosing rare malignant epithelial odontogenic tumors.
  • While IHC aids in specific diagnoses like clear cell odontogenic carcinoma, it has limitations for other types.
  • Early and accurate diagnosis is vital due to the aggressive nature and metastatic potential of these tumors.

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