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Malignant epithelial odontogenic tumors.
1Department of Pathology and Medicine, University of the Pacific School of Dentistry, San Francisco, CA 95115, USA.
Seminars in Diagnostic Pathology
|December 10, 1999
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.
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.