Abstract : Neoplasic and non neoplasic lesions of the jaws are regularly classified as radiopaque or radiolucent, odontogenic or not odontogenic.However, a significant number of pathologies can be classified as mixed or are initially radiolucent to later become radiopaque or mixed. Certain diseases present different stages of development that are radiolucent, radio opaque or mixed. The purpose of this article is to provide a better understanding of the imaging of these lesions based on a literature review ,and illustrated by personal clinical observations.