An excisional biopsy specimen from a 79-year-old Caucasian man with a chief complaint of a painful swelling in the posterior left mandible was sent to the Center of Diagnosis of Oral Diseases at the Dentistry School, Federal University of Pelotas, Brazil, in 2015. The patient was fully edentulous. The surgeon found the color and texture of the oral mucosa to be normal. No positive lymph nodes were noted on extraoral examination. Comorbidities and evolution time of the lesion were unknown. The patient did not report a habit of smoking or daily drinking of alcoholic beverages.