Caucasian patient, ECOG-PS 0, 38 years old, presented at the hospital with symptoms of pain in the lower left region of the mandible, objectively without swelling, on radiographic examination, she presented an extensive lesion with radiolucency in the region of element 37, with image filling, displacement of element 38 and apical involvement of element 36. In the tomographic exam, he presented a lesion with great destruction of the lingual wall and accentuated bone sequestration. It was opted for the differential diagnosis of the same by biopsy of the region with partial removal of healthy and diseased tissue associated with aspiration puncture, the histopathological examination was diagnosed as odontogenic clear cell carcinoma, a rare malignant tumor of epithelial origin, common in aged over 50 years and without behavioral pattern at its emergence.