At the beginning of 2017, the fourth edition of the WHO Classification of Head and Neck Tumours was published, 12 years after the previous version. Notably, various changes introduced in the third edition have been revised so in some aspects the current classification has more similarities to the second edition of 1992 than to the third edition. A central goal of the editors was to create a classification that can be used worldwide. Molecular findings have therefore been included and updated but are not mandatory for establishing a diagnosis. This article discusses and comments on the most important changes implemented in the classification of gnathic lesions.
Keywords: Ameloblastoma; Bone neoplasms; Head and neck neoplasms; Odontogenic Tumors; World Health Organization.