Benign mixed tumor with malignant behaviour: relate of 3 cases - Machado, M.T.A.S.; Cernea, C.R.; Cordeiro, Anói Castro; Araújo Filho, V.J.F.; Arap, Sami; Cordeiro, Anói Castro; Ferraz, Alberto Rossetti (International Conference on Head and Neck Cancer, 2000)