Ameloblastoma is na aggressive but benign epithelial neoplasm of odontogenic origin, and the occurrence of odontogenic epithelium in the wall of a dentigerous cyst is well-known entity. The presence of ameloblastic proliferation in the walls of
odontogenic cysts has been reported for many years. Cahn in 1933 described a case in which he considered an ameloblastoma to have originated in a dentigerous cyst and numberous other case sof ameloblastomatous proliferation have since been
reported.
In 1977, Robinson and Martinez described a distinct variant of ameloblastoma in which the response to curettage was found to be favorable with a recurrence rate of 25%. The gross and microscopic features indicated that this variant was associated
with a
large cystic cavity with either luminal or mural proliferation of ameloblastic tumor cells, and they referred to this variant as unicystic ameloblastoma.
Unicystic ameloblastoma occurs most commonly in the second and third decades of life, which is considerably younger than the average age of discovery for the classical ameloblastoma. For the accurate histopathological diagnosis of the unicystic
ameloblastoma, the specimen obtained the excisional biopsy, complete enuclea tion or incisional biopsy from the multiple site of the lesion.
This article prvides histopathologic evidence of multilocular unicystic ameloblastoma in which ameloblastic tissue was associated with a dentigerous cyst that was found in a 31-year-old female, and complete radiographic, photographic, and
microscopic
documentation is presented.
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