keratocyst

Odontogenic cyst derived from remnants of the dental lamina and appearing as a unilocular or multilocular radiolucency which may produce jaw expansion; epithelial lining is characterized microscopically by a uniform thickness, a corrugated superficial layer of parakeratin, and a prominent basal layer composed of palisaded columnar cells; associated with the bifid rib basal cell nevus syndrome.

- odontogenic k. (ke-ra′to-sist) a cyst of dental lamina origin with a high recurrence rate and well-defined histologic criteria of a corrugated parakeratin surface, uniformly thin epithelium, and a palisaded basal layer. One manifestation of the basal cell nevus syndrome.

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ker·a·to·cyst (kerґə-to-sist) [kerato- + cyst] an odontogenic cyst lined with a layer of keratinized squamous epithelium and commonly associated with a primordial cyst.

Keratocyst visible as a loculated radiolucency extending from the condylar neck to the lower first molar region. There is thinning of the bony cortices but no jaw expansion, and the lower third molar is displaced.