Bilateral gingival swellings in the mandibular canine-premolar areas.

A bilateral occurrence of gingival cyst of the adult has been presented. A comparison of the gingival cyst and lateral periodontal cyst indicates that these lesions may represent intraosseous and extraosseous counterparts. Criteria for differentiation of the two similar lesions were presented. Because not all lesions are clinically apparent, the frequency of occurrence of this cyst may be underestimated.