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BACKGROUND AND AIM: The calcifying epithelial odontogenic tumor (CEOT) is a rare entity described by Pindborg and represents < 1% of all odontogenic tumors. Nearly 200 cases of this neoplasm have been reported to date. It mostly occurs in the posterior mandible associated with an impacted tooth, most often a mandibular molar. Patients are usually between 30 and 50 years of age, with no sex predilection. CASE REPORT: Presented here is a case of an intraosseous CEOT, which occurred in a 16-year-old female in the body of the mandible extending from tooth nos. 32 to 47 with no specific clinical manifestations. CONCLUSION: CEOT accounts for < 1% of all odontogenic tumors. Approximately 200 cases have been reported today. This case report describes the clinical, radiographic and microscopic features of a large CEOT in a 16-year-old girl, which although was big in size, had no specific clinical manifestations. The patient reported a relatively rapid evolution of the tumor in the mandibular region, which is a unique manifestation.