Peripheral ameloblastoma: Case report with immunohistochemical investigation

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Ameloblastoma is a common tumor within the odontogenic group of tumors. This tumor usually occurs intraosseously, and relatively seldom ap­ pears in the soft tissues of the alveolar process. A few cases of peripheral ameloblastoma have been reported, and its histologic characteristics have been studied in comparison with central ameloblas­ toma. t, 2 A common histologic pattern of peripheral ameloblastoma appears to be proliferating columnar epithelial cells resembling the tooth germ;' or basal cell carcinoma." The origin of peripheral ameloblas­ toma has not yet been established. Derivation from odontogenic epithelial rests" or surface epithelium" has been proposed. We report a case of peripheral ameloblastoma that developed on the lingual gingiva in the left man­ dibular premolar region . Lectin binding and kera­ tins were histochemically investigated in this tumor and compared with the findings in central arnelo­ blastomas and basal cell carcinomas.

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