 Odontogenic keratocysts make up around 19% of jaw cysts.In the WHO/IARC classification of head and neck pathology, this clinical entity had been known for years as the odontogenic keratocyst; it was reclassified as keratocystic odontogenic tumour (KCOT) from 2005 to 2017.In 2017 it reverted to the earlier name, as the new WHO/IARC classification reclassified OKC back into the cystic category.