Hybrid odontogenic cysts and tumors-A unique case series

Introduction

Odontogenic cysts and tumors, which develop from the structures involved in tooth formation, show a wide range of histopathological variations. Sometimes, different types of lesions can appear together within the same tissue sample, resulting in what are known as hybrid odontogenic cysts or tumors—unusual combinations that form distinct and complex pathologies.

Case report

This article outlines four unique cases of such hybrid lesions. The first case involved a mix of an Orthokeratinised Odontogenic Cyst (OOC) and a Calcifying Odontogenic Cyst (COC). The second case showed a hybrid of OOC with a Glandular Odontogenic Cyst (GOC). In the third case, the lesion was a combination of Ameloblastoma and an Odontogenic Keratocyst (OKC). The final case presented a rare hybrid tumor consisting of an Adenomatoid Odontogenic Tumor (AOT) and Desmoplastic Ameloblastoma. These diagnoses were reached through a comprehensive, multidisciplinary approach involving clinical evaluations, imaging, histopathological assessments, and immunohistochemical analyses.

Conclusion

Hybrid lesions are different from collision lesions, which occur when two separate pathologies overlap in one area. Instead, hybrid odontogenic lesions display a blend of histological traits from two or more recognized types of cysts or tumors. While their exact cause remains uncertain, it’s believed that pluripotent odontogenic epithelial cells might give rise to multiple tissue patterns simultaneously within a single lesion. These cases pose significant challenges for both diagnosis and treatment. More in-depth research—especially at the molecular and immunohistochemical levels—is needed to improve our understanding and management of these complex and rare conditions.