Congenital sublingual dermoid cyst.

Oral cavity dermoids account for less than a quarter of those dermoids occurring within the head and neck region and about 1.6% of all dermoids. The anterior floor of the mouth is the most common site within the oral cavity, but overall, it is uncommon. Most lesions are seen in young adults; congenital sublingual dermoids occurring in infancy are thus rare. Included in this report are the background literature, including definition and classification of these cysts, and the clinical characteristics of such lesions.