Primary intraosseous squamous cell carcinoma derived from a dentigerous cyst

A Case of Primary Intraosseous Squamous Cell Carcinoma Arising in Dentigerous Cyst of Mandible

Primary intraosseous squamous cell carcinoma (PISCC) arising from dentigerous cysts (DCs) is rare. Herein, we present a rare case of a 35 year-old Japanese man with PISCC arising from a DC. Clinicians should be aware of the potential for malignant changes to SCC in asymptomatic DCs and should conduct follow-up. Moreover, histological examination of the entire specimen should be performed even if the lesion is suspected to be benign.

Transformation of Odontogenic Cysts to Neoplasms - A Systematic Review

Background

Odontogenic cysts have the potential to transform into neoplasms. However, the characteristics of those which transformed to neoplastic tissues have not been well described and the exact causes of that phenomenon are not yet clear.

Objectives

This study aims to describe characteristics of odontogenic cysts that transformed into neoplasms and to look for their potential etiologies.

Data Sources

English-written studies indexed in PubMed, Science Direct, and Proquest were assessed using keywords verified by Medical Subject Headings: 'Odontogenic Cyst' and 'Neoplastic Cell Transformation'.

Study Eligibility Criteria

Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) guidelines were used as guidance.

Participants

Following steps in PRISMA guidelines, 19 articles were fully reviewed (three case series and 16 case reports) with 27 subjects of 16 males (59%) and 11 females (41%) from 15 to 86 years old.

Results

Cystic origins were eight dentigerous cysts, four odontogenic keratocysts, two residual cysts, one radicular cyst, one calcifying odontogenic cyst, one follicular cyst, one glandular odontogenic cyst, and nine unspecified odontogenic cysts that transformed to ameloblastoma (3 cases) and carcinoma (24 cases).

Limitations

Neoplastic transformations of odontogenic cysts arose from epithelial remnants of inadequate odontogenic cyst removal and chronic inflammation due to infection. However, the exact causes of their transformations remain unclear.

Conclusions

Therefore, careful removal of odontogenic cysts and regular postoperative follow-ups are key to prevent recurrence and neoplastic transformation. Future studies are needed to investigate potential causes of neoplastic transformation of odontogenic cysts.