Abstract
Cysts are pathologic cavities in bone, and true cysts display a thin epithelial cell lining derived from either odontogenic or nonodontogenic sources. In this chapter, we also discuss cyst-like entities that may not be cavities in bone or that lack an epithelial lining. These entities are included in this chapter because on imaging, they may show the same curved, rounded, or "hydraulic" borders that cysts classically display. Although cysts generally grow slowly, they will become clinically apparent when a bone enlarges or teeth are displaced. In such instances, imaging may be the first investigation conducted to determine the nature of the cyst and the involvement of adjacent anatomic structures.
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