This case report describes an unusual odontogenic carcinoma, which was dete
cted during routine periodontal examination. The lesion occurred in a denti
gerous cyst associated with an impacted third molar in an otherwise asympto
matic 66-year-old male patient. The impacted tooth and lesion were excised
based on evidence of radiographic change and clinical findings. An unusual
histopathologic presentation is reported. The treatment provided for this t
umor and the management of impacted teeth is reviewed.