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  • Title: Orthokeratinized odontogenic cyst: a clinicopathological and immunocytochemical study of 15 cases.
    Author: Li TJ, Kitano M, Chen XM, Itoh T, Kawashima K, Sugihara K, Nozoe E, Mimura T.
    Journal: Histopathology; 1998 Mar; 32(3):242-51. PubMed ID: 9568510.
    Abstract:
    AIMS: Intraosseous jaw cysts with a solely orthokeratinized lining epithelium have been suggested to differ from the typical odontogenic keratocysts (OKC) by exhibiting a less aggressive behaviour. We report 15 cases of such cyst type under the term of 'orthokeratinized odontogenic cyst (OOC)' and compared their clinical, histological and immunocytochemical features with that of OKC. METHODS AND RESULTS: The cysts of the present series were all solitary lesions, occurred mostly in young male patients, and showed a predilection for the posterior mandible areas. Follow-up of 14 patients, nine of whom were treated by simple enucleation, revealed no recurrence over a period of 3.5-12 years after surgery. None of the patients had any association with the naevoid basal cell carcinoma syndrome. Furthermore, histological and immunocytochemical comparison between OOC and OKC revealed marked differences in their morphology and epithelial expression. The lining epithelium of OOC lacked the typical features of OKC and appeared to show a lower proliferative activity. CONCLUSION: These findings suggest that OOC is clinicopathologically separate from other types of odontogenic cysts and may thus constitute a distinct clinical entity.
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