[Ameloblastoma of the maxillary sinus. Apropos of a case].

The ameloblastoma is benign odontogen tumour developed from epithelial remains of MALASSEZ. Because of the inclination to invade in an inexorable way all the surrounding tissues and of the faculty of recurrence after removal, one attributes him the qualifier of good-hearted tumour to local wickedness. The mandibulary localization is the most frequent. Toward the maxillary, it is mostly observed in the tuberosity region. The authors report in the work one case of ameloblastoma developed from the pericoronal cyst of an intrasinusal ectopic canine tooth.