Keratoameloblastoma: complex histologic variant of ameloblastoma.

Keratoameloblastoma is a rare subtype of ameloblastoma that has been reported only 12 times previously in the literature. Ameloblastomas are benign, locally aggressive neoplasms that constitute approximately 1% of odontogenic neoplasms. The mandible is involved in 80% of cases and the maxilla 20%.