Orthokeratinized odontogenic cyst arising from dentigerous cyst: A case report

One specific type of keratinized odontogenic cysts is orthokeratinized odontogenic cyst which is different from odontogenic keratocyst in clinical and pathological features completely. Also orthokeratinized odontogenic cyst can mimic typical characteristic clinicopathologic features of some other developmental odontogenic lesions such as dentigerous cyst and the odontogenic keratocyst,  there is no previous report based on transforming of dentigerous cyst to orthokeratinized odontogenic cyst. We described a case of orthokeratinized odontogenic cyst originated from a dentigerous  cyst in a 30-year-old female discovering accidentally in routine radiography.