A case of immature teratoma involving mandible in a 56 year old woman is reported. This teratoma is composed of ameloblastoma structures mixed with some usual components of teratoma: osseous and cartilaginous foetal tissue, indifferenciated blastema, neuroblastic structures, acinous glands and melanotic cells. A lymph node is involved by metastatic mature glial tissue. This patient is treated by pelvimandibulectomy and irradiation. Histogenesis of this teratoma unusual by this ameloblastic component and this mandibular localization is reviewed.
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