OP – Oral PresentationCALCIFYING CYSTIC ODONTOGENIC TUMOR ASSOCIATED WITH ODONTOGENIC KERATOCYST: A COMBINED ODONTOGENIC TUMOR?

Cases of calcifying cystic odontogenic tumor (CCOC) associated with odontogenic keratocyst (OKC) have not been reported. An 81-year-old male patient was referred for diagnosis of mandibular radiolucent image identified in a routine radiographic examination. Computed tomography revealed a well-circumscribed, unilocular, hypodense image, located in the right edentulous mandibular body. Residual radicular cyst was the clinic-radiographic diagnosis. Under local anesthesia, an incisional biopsy was performed. Microscopically, a cystic cavity lined by ghost cells and basal cells showing reverse nucleus polarity was observed. Solid areas were also noted. In addition, there were cystic cavities lined by epithelium presenting a corrugated parakeratin surface and prominent basal cells disposed in a palisaded fashion. The diagnosis was odontogenic tumor with areas of CCOC and OKC. The lesion was excised and the patient is under follow-up, without signs of recurrence after 1 year of treatment. Odontogenic tumor with this association seems to present a good prognosis.