-Malignant lesions of the jaw-bones may mimic odontogenic infections and other disease conditions in the oral cavity in presentation, leading to late diagnosis by the unwary clinician. The purpose of this paper is to illustrate clinical features and radiographic appearance that should make the dentist thinking in a diagnosis of a malignant tumour of the jaw. The authors present 3 cases of malignancies in the jawbones and discuss the diagnostic lessons from each one.