[Histogenesis of adamantinomas]

Following some general remarks on the histogenesis of adamantinomas, the results of histological research on the periodontal tissues, the walls of dental cysts and 21 cases of adamantinomas are reported. Results back up the hypothesis that adamantinoma-like tumours may derive from epithelial residue in the periodontal tissue in the wall of dental cysts and from cystic epithelium itself. It is also shown that the basal stratum of the oral epithelium may give rise to adamantionoma-like tumours which could be regarded as adamantine baseliomas rather than as odontogenous adamantinomas proper.