Developing complex odontoma in a 4-year-old child with active ameloblastic follicles: A case report.

The World Health Organization (WHO) classification of odontogenic tumors, in its different iterations, has seen several modifications in benign mixed odontogenic tumors. Odontoma is a benign mixed odontogenic tumor that shows dental hard tissue formation to varying degrees. Although odontomas are the most common odontogenic tumors, they are mostly seen in the form of compound odontomas, where the dental hard tissues resemble tooth-like structures. Complex odontoma shows a haphazard mass of dental hard tissues and is generally identified at an older age (mean age of around 20 years). Incidence of complex odontoma in very young children is quite rare, with only around 10 cases associated with the primary dentition being reported in the literature till date. Unlike other odontomas, our case showed an active epithelial component in the form of tooth buds and ameloblastic follicles along with the hard tissues, which made it difficult to distinguish from other similar lesions like ameloblastic fibroma with hard tissue formation and ameloblastoma arising from an odontoma. This article reports the 11th case of complex odontoma associated with the primary dentition, and the youngest such case to be reported in the Indian population.