malignant ameloblastoma

malignant ameloblastoma

A neoplasm in which the pattern of an ameloblastoma and cytological features of malignancy are shown by the primary growth in the jaws and/or by any metastatic growth. Tumours meeting these criteria may arise as a result of malignant change in a pre-existing ameloblastoma, or possibly as a primary malignant ameloblastoma not preceded by an ameloblastoma.