Orthokeratinized odontogenic cyst (OOC) was first described as an orthokeratinizing variant of odontogenic keratocyst (OKC) in 1981.
It is now known and accepted that OOC is a distinct clinic-pathologic entity on its own. In fact it has been listed as a developmental odontogenic cyst in the recent (2017) WHO classification of odontogenic cysts.
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