Ameloblastic fibroma of the mandible : Report of a case

Yasuo YOKOBAYASHI, Yasuhiro HIDESHIMA, Michiyuki MAEDA, Sayuri KAWAKITA
Department of Dentistry, Oral and Maxillofacial Surgery, Toyama Prefectural Central Hospital (Chief: Yasuo YOKOBAYASHI)

Abstract :
　　Ameloblastic fibroma is classified in an odontogenic mixed tumor and its report is extremely rare. We experienced a case of ameloblastic fibroma of the mandible.
　　The patient was a 51-year-old man with a bony swelling in the incisal to the left premolar region of the mandible. Radiographic examination showed a tumorous mass consisting of a mixture of radiolucent and radiopaque lesions. Radioisotope scintigram with 99mTc showed 2 hot spots corresponding to the mass of the mandible. The clinical diagnosis of a tumor of the mandible was made. Biopsy revealed the lesion to be an ameloblastic fibroma. The tumor was removed by partial resection of the mandible with the patient under general anesthesia. The postoperative course was uneventful and 3 years later, there was no evidence of recurrence of the lesion.
　　Microscopically, the tumor consisted of a solid lesion with proliferation of ameloblastic cells and fibrous connective tissue and a cystic lesion with a lining of ameloblastic cells accompanied by proliferation of fibroblastic cells.

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