[Extra-osseous mandibular ameloblastoma].

Gingival ameloblastoma is a rare odontogenic tumor which shares the same histology as endo-osseous ameloblastoma but from which it differs in terms of its course by the absence of "local malignancy". There would appear to be two probable origins concerning this lesion: Serre debris and the epithelium of the gingival mucosa. However, the etiopathogenesis remains controversial, raising problems of pathological distinction from gingival basal cell carcinoma.