Introduction

	Radiographically, odontogenic keratocyst present predominently as a unilocular radiolucency with well-developed sclerotic borders ( Figure 1A ).
	They may also present as a multilocular radiolucency with a ratio of unilocular to multilocular varying from 3:112 to 1:1.3.24  Perhaps the multilocular appearance described in the latter was more of a unilocular with scalloped borders lacking true compartment formation ( Figure 1B ).24
	Odontogenic keratocysts of the maxilla are smaller in size compared to the mandible.  When they are large, they tend to expand bone.  No difference in site distribution was seen between unilocular and multilocular cysts.12  These lesions can also present as a small and oval radiolucency between teeth simulating a lateral periodontal cyst ( Figure 1A ).  They can also appear as a radiolucency simulating a residual apical periodontal cyst ( Figure 1C ).
	Multiple keratocysts ( Figure 1D & Figure 1E ) are frequently associated with the bifid-rib basal cell nevus syndrome (Gorlin syndrome).25  Unilocular radiolucency with sclertotic border is also know to be associated with Gorlin syndrome ( Figure 1E ).  For purposes of this paper, the bifid-rib basal cell nevus syndrome will be referred to as the Gorlin syndrome.  Some authors suggest that as many as half of odontogenic keratocysts are related to the Gorlin syndrome.29  These lesions grow to sizes larger than any other odontogenic cyst.  They more often penetrate the bone rather than expand it and grow in an anterior to posterior direction.30  Despite this aggressive growth, they often remain asymptomatic.31

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