The world health organisation has categorised KCOT as an odontogenic keratocyst as of now . Though having the characteristic features of neoplasia and increased capability of proliferation of epithelial layers , disputation on top of the the behaviour and management still persists from centuries. Many prior attempts have been made to classify this cyst from centuries back starting from 1887. In 1971 & 1992 it was under the category of developmental odontogenic cyst in classification proposed by WHO, OKC has been recategorized and given a name as keratocystic odontogenic tumor (KCOT) by the WHO classifications of head and neck tumors in 2005 due to its aggressive behavior, high recurrence rates and specific histological characteristics. But recently WHO classification of Head and Neck pathology (2017) has reclassified the lesion back to cystic entity. The purpose of the article is to discuss this fascinating kind of lesion and to provide a clear cut information regarding the reason for reclassification , its behaviour and new modalities in treatment.

Keywords : Odontogenic Keratocyst, Keratocystic Odontogenic Tumour, Who, Aggressive Behaviour, Infiltrative Nature, Reccurence, Ptch Gene